Members of the Free Syrian Army react as they fire a homemade rocket toward regime forces in Deir al-Zor on Sunday, June 16. Tensions in Syria flared in March 2011 during the onset of the Arab Spring, escalating into an ongoing civil war. View the most compelling images taken since the start of the conflict.
Read a version of this story in Arabic.
(CNN) -- The overall death toll in devastated Syria has surpassed an estimated 60,000 people, the United Nations said Wednesday, a dramatic figure that could skyrocket as the civil war persists.
To put it in perspective: 60,000 people is roughly the population of Terre Haute, Indiana; or Cheyenne, Wyoming. It's how many people would fit in Dodger Stadium, and it's more than the 50,000-plus U.S. combat deaths in Vietnam.
The figure is about 15,000 higher than the death toll CNN had cited from a collection of sources.
It's "truly shocking" and shameful, said U.N. High Commissioner for Human Rights Navi Pillay, who blamed the international community for inaction.
"Collectively we have fiddled at the edges while Syria burns," she said. "While many details remain unclear, there can be no justification for the massive scale of the killing highlighted by this analysis."
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Inside Syria, anti-government activists brought their personal perspective to the new death estimate: "No wonder!" Hama activist Mousab Alhamadee said. "We live on the ground and we see the massacres daily."
Western and Arab nations have denounced President Bashar al-Assad's regime, but they have been been reluctant to intervene in hopes of ending the warfare.
What's next for Syria in 2013?
They haven't been successful in forging tough action against Syria at the U.N. Security Council because of opposition from Russia and China, both of which have long had friendly relations with and economic ties to Damascus. While some countries have passed along weapons to the rebels, the larger world community has avoided being drawn into a war, fearing a bloody quagmire, such as the Vietnam War for the United States or the invasion of Afghanistan for the Russians.
Echoing the fears of U.N.-Arab League envoy Lakhdar Brahimi, Pillay worried about more deaths "unless there is a quick resolution to the conflict."
"I fear thousands more will die or suffer terrible injuries as a result of those who harbor the obstinate belief that something can be achieved by more bloodshed, more torture and more mindless destruction," she said.
Pillay said the number of deaths is higher than expected.
"This massive loss of life could have been avoided if the Syrian government had chosen to take a different path than one of ruthless suppression of what were initially peaceful and legitimate protests by unarmed civilians," she said.
"As the situation has continued to degenerate, increasing numbers have also been killed by anti-government armed groups, and there has been a proliferation of serious crimes including war crimes, and -- most probably -- crimes against humanity, by both sides."
The 60,000, she said, "is likely to be an underestimate of the actual number of deaths." Citing the discovery of mass graves in newly liberated government bases, Alhamadee, the activist, said: "The number I think is far greater than this, and lots of people are missing."
"The recording and collection of accurate and reliable data has grown increasingly challenging due to the conflict raging in many parts of the country," Pillay said.
Rupert Colville, a U.N. spokesman, agrees that the number "is probably a minimum" and reflects a killing field of war crimes.
"There's not a shadow of doubt now that war crimes and crimes against humanity have been committed. That said, in each individual case, the final judgment has to be made by a court. It's hard to quantify at this point," he said.
"This is a classic case of a conflict that's spiraling downwards, becoming ever more ghastly. We've seen this before in the Balkans and other places. The worse it becomes, the more difficult it is to resolve."
Ahawa, who posted a reaction on CNN.com's comment section, sees a dark future for Syria, regardless. "Syria is doomed, no matter who wins, the terrorist rebels or the terrorist regime, the country ... will take tens of years to rebuild,' Ahawa wrote. "Even if Assad is toppled in the next few months, sectarian fighting will still go on for years."
Wimcorbijn, another CNN.com commenter, accused Western and Arab nations of wanting to topple al-Assad at any cost.
"I think the best bet for Syria now is to keep Assad as leader," wimcorbijn wrote. "It is the right time for (countries such as Brazil, Russia, India, China and South Africa) to step in and support to help to defeat the rebels. Once the rebels are defeated, they can force to introduce democracy as well as political reforms in Syria."
Air attacks, shelling, tank fire, bomb attacks, street-to-street fighting and sectarian fighting have all contributed to the rising toll, Pillay said. Deaths have increased from 1,000 a month in the summer of 2011 to more than 5,000 a month since July, she said.
Deaths have been most prevalent in Homs, the Damascus outskirts, Idlib, Aleppo, Daraa and Hama. More than three-quarters of the victims are male, and 7.5% are female, Pillay said. The gender of the others isn't clear, and analysts couldn't "differentiate clearly between combatants and non-combatants."
The inability of the U.N. Security Council and the international community to stop the violence "shames us all," she said.
Read more: Syria's grim toll continues into 2013
Death estimates have varied among opposition groups that have issued daily counts. For example, the Syrian Observatory for Human Rights says more than 46,000 people have died since March 2011.
U.N. data specialists counted 59,648 people reported killed in Syria between March 15, 2011, and November 30, 2012, Pillay said. Scores of deaths were reported every day in December.
Related: 2013 prediction: 100,000 deaths
Latest clashes
On Wednesday, fighting sent the daily death toll higher. More than 207 people were killed, mostly in and around Damascus, according the opposition Local Coordination Committees of Syria.
Syrian government warplanes hammered the Damascus suburbs and other targets. At least 74 people died and dozens were wounded in the Damascus suburb of Mleiha when government planes carried out an airstrike on a fuel station, the LCC said, citing initial reports. The toll of "martyrs" will probably rise "due to continuous pulling of the bodies from under the rubble," the LCC said.
Aerial shelling also was reported in the Damascus suburb of Harasta, in the cities of Aleppo and Deir Ezzor and other locations.
In Idlib province, Syrian rebels, including jihadists, fought to wrest a key military air base from government forces Wednesday, the opposition said, as anti-regime fighters kept up the heat on al-Assad's forces. Al-Nusra Front, a militant group that the United States designated last month as a terrorist movement, is among three rebel factions attacking the base, rebels said in a statement.
"The battle to liberate Taftanaz military airport has started," the rebels said. "Taftanaz airport has been delivering horrors to Muslims. The warplanes fly from there on a daily basis, to throw explosive barrels on villages and towns."
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The other factions participating in the effort are Battalions of Ahrar Al-shaam and the Islamic Forefront. Ahrar is an Islamist coalition with some Salafist elements that cooperates with the Free Syrian Army. The Islamic Forefront is a larger umbrella group of Islamist organizations; one of its members is Ahrar.
About 400 soldiers are based at the airport, along with a number of pro-government militia.
At the base are 30 planes, including transportation craft and fighting jets; seven armored vehicles, including tanks and armored personnel carriers; artillery and rocket launchers.
Casualties have been reported on both sides in the fighting, but precise numbers were not available because the government has restricted international journalists' access.
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CNN's Joe Sterling, Salma Abdelaziz and Yousuf Basil reported from Atlanta, and Kareem Khadder contributed to this report from Jerusalem
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Syrian rebels leave their position in the northwestern town of Maaret al-Numan on Thursday, June 13. The White House said that 
Forces loyal to Syrian President Bashar al-Assad are seen near Qusayr on Thursday, May 30.
Syrian rebels take position in a house during clashes with regime forces in the old city of Aleppo on May 22.
Syrian army soldiers take control of the village of Western Dumayna north of the rebel-held city of Qusayr on Monday, May 13. Syrian troops captured three villages in Homs province, allowing them to cut supply lines to rebels inside Qusayr town, a military officer told AFP.
Rebel fighters fire at government forces in the northern Syrian city of Aleppo on Sunday, May 12.
Searchers use a flashlight as they look for survivors among the rubble created by what activists say was a missile attack from the Syrian regime, in Raqqa province, Syria, on April 25.
A Kurdish fighter from the "Popular Protection Units" (YPG) takes position inside a building in the majority-Kurdish Sheikh Maqsood area of Aleppo, on Apri. 21.
People walk past destroyed houses in the northern Syrian town of Azaz on Sunday, April 21.
Free Syrian Army fighters take positions prior to an offensive against government forces in the Khan al-Assal area, near Aleppo on Saturday, April 20.
Men inspect damage at a house destroyed in an airstrike in Aleppo on April 15.
Syrian and Kurdish rebel fighters walk in the Sheikh Maqsud district of Aleppo on April 14.
A female rebel monitors the movement of Syrian government forces in Aleppo's Sheikh Maqsud neighborhood on April 11.
A rebel runs to avoid sniper fire from Syrian government forces in Aleppo on Thursday, April 11.
Syrian rebels observe the movement of Syrian government forces around Al-Kendi hospital in Aleppo on Wednesday, April 10.
Rescue teams and security forces check out the scene of a deadly car bomb explosion in Damascus on April 8.
The fighting has taken a toll on buildings in Aleppo's Saladin district, seen here on April 8.
A Syrian rebel runs for cover in Deir ez-Zor on April 2.
A rebel checks for snipers across the street toward the Citadel in Aleppo, Syria, on Saturday, March 30, in this photo taken by iReporter Lee Harper.
A Free Syrian fighter mourns the death of a friend in Aleppo on March 30, in this photo taken by iReporter Lee Harper.
A Syrian opposition fighter runs for cover from Syrian army snipers in Aleppo on Wednesday, March 27.
A Syrian girl covers her face to protect herself from fumes as a street covered with uncollected garbage is fumigated in Aleppo on Sunday, March 24.
A Syrian man and his family drive past damaged buildings in Maarat al-Numan, on Wednesday, March 20.
Syrians carry the body of a Syrian army soldier during a funeral ceremony in Idlib province on Tuesday, March 19.
Syrian rebels take position in Aleppo, the largest city in the country, on March 11.
Syrian men search for their relatives amongst the bodies of civilians executed and dumped in the Quweiq River on March 11.
A Free Syrian Army fighter looks back as smoke rises during fighting between rebel fighters and forces loyal to Syria's President Bashar al-Assad on the outskirts of Aleppo on Saturday, March 2.
Residents read Shaam News newspapers published by the Free Syrian Army in Aleppo on March 2.
A member of the Free Syrian Army reacts to the death of a comrade who was killed in fighting, at Bustan al Qasr cemetery in Aleppo on Friday, March 1.
A rebel fighter throws a home-made grenade at Syrian government forces in Aleppo on February 16.
A member of the Free Syrian Army stands with his weapon as he looks at a rainbow in Aleppo on February 16.
A Syrian woman looks through a bus window in Aleppo on February 14.
Free Syrian Army fighters walk through a dust-filled stairwell in Damascus on February 7.
A Syrian rebel gestures at comrades from inside a broken armored personnel carrier in Al-Yaqubia on February 6.
A rebel fighter throws a hand grenade inside a Syrian Army base in Damascus on February 3.
People stand in the dust of a building destroyed in an airstrike in Aleppo, Syria on February 3.
Free Syrian Army fighters run as they enter a Syrian Army base during heavy fighting in the Arabeen neighborhood of Damascus on February 3.
An unexploded mortar shell fired by the Syrian Army sits lodged in the ground in Damascus on January 25.
Fighters from Fateh al Sham unit of the Free Syrian Army fire on Syrian Army soldiers at a check point in Damascus on January 20.
A Free Syrian Army fighter walks between buildings damaged during Syrian Air Force strikes in Damascus on January 19.
A Syrian rebel fighter tries to locate a government jet fighter in Aleppo on January 18.
Syrian rebels launch a missile near the Abu Baker brigade in Albab on January 16.
A Syrian boy walks near rubbish next to tents at a refugee camp near the northern city of Azaz on the Syria-Turkey border, on January 8.
Syrians look for survivors amid the rubble of a building targeted by a missile in Aleppo on January 7.
A father reacts after hearing of a shelling by forces loyal to Syria's President Bashar al-Assad in Aleppo on January 3.
A patient smokes a cigarette at Dar Al-Ajaza psychiatric hospital in Aleppo on December 18, 2012. The psychiatric ward, housing around 60 patients, has lacked the means to function properly since fighting broke out there in July.
Syrians mourn a fallen rebel fighter at a rebel base in the al-Fardos area of Aleppo on December 8.
Members of Liwa (Brigade) Salahadin, a Kurdish military unit fighting alongside rebel fighters, monitor the area in the besieged district of Karmel al-Jabl in Aleppo on December 6.
A member of Liwa Salahadin aims at a regime fighter in the besieged district of Karmel al-Jabl in Aleppo on December 6.
Two young boys sit underneath a washline in a refugee camp on the border between Syria and Turkey near Azaz on December 5.
The bodies of three children, who were allegedly killed in a mortar shell attack that landed close to a bakery in Aleppo, on December 2, are laid out for identification by family members at a makeshift hospital at an undisclosed location of the city.
Smoke rises in the Hanano and Bustan al-Basha districts in Aleppo on December 1 as fighting continues through the night.
Damaged houses in Aleppo are seen after an airstrike on November 29.
A Syrian rebel mourns the death of a comrade in Maraat al-Numan on November 20.
Syrians protesters stand on Assad's portrait during an anti-regime demonstration in Aleppo on November 16.
A Syrian rebel takes cover during fighting against Syrian government forces in Aleppo on November 15.
Syrian opposition fighter Bazel Araj, 19, sleeps next to his pistol in Aleppo on November 11.
A rebel fighter fires at a Syrian government position in Aleppo on November 6.
A Syrian rebel leaps over debris left in the street while running across a "sniper alley" near the Salahudeen district in Aleppo on November 4.
Rebels hold their position in the midst of a battle on November 3 in Aleppo.
A man cries while being treated in a local hospital in a rebel-controlled area of Aleppo on October 31.
A man is treated for wounds after a government jet attacked the Karm al-Aser neighborhood in eastern Aleppo on October 31.
A Syrian rebel interrogates a handcuffed and blindfolded man suspected of being a pro-regime militiaman in Aleppo on October 26.
Smoke rises from a fuel station following a mortar attack as Syrian women walk on a rainy day in the Arqub neighborhood of Aleppo on October 25.
A Syrian rebel fires at an army position in the Karm al-Jabal district of Aleppo on October 22.
A wounded Syrian boy sits on the back of a truck carrying victims and wounded people to a hospital following an attack by regime forces in Aleppo on October 21.
A man lies on the ground after being shot by a sniper for a second time as he waits to be rescued by members of the Al-Baraa Bin Malek Battalion, part of the Free Syria Army's Al-Fatah brigade, in Aleppo on October 20.
Syrian army soldiers run for cover during clashes with rebel fighters at Karam al-Jabal neighborhood of Aleppo on October 20.
Smoke rises after a Syrian Air Force fighter jet fired missiles at the suburbs of the northern province of Idlib on October 16.
A Syrian opposition fighter stands near a post in Aleppo on October 11.
A Syrian man mourns the death of his father, who was killed during a government attack in Aleppo on October 10.
A rebel fighter is carried by his friends and laid on a gurney to be treated for gunshot wounds sustained during heavy battles with government forces in Aleppo on October 1.
Syrian rebels help a wounded comrade to an Aleppo hospital after he was injured in a Syrian army strike on September 18.
Free Syria Army fighters are reflected in a mirror they use to see a Syrian Army post only 50 meters away in Aleppo on September 16.
A Syrian man carrying grocery bags tries to dodge sniper fire as he runs through an alley near a checkpoint manned by the Free Syria Army in Aleppo on September 14.
A woman walks past a destroyed building in Aleppo on September 13.
Free Syrian Army fighters battle during street fighting against Syrian army soldiers in Aleppo on September 8.
A Syrian man wounded by shelling sits on a chair outside a closed shop in Aleppo on September 4.
A woman sits in her wheelchair next to her house, damaged by a Syrian air raid, near Homs on August 26.
Members of the Free Syrian Army clash with Syrian army soliders in Aleppo's Saif al-Dawla district on August 22.
A man mourns in front of a field hospital on August 21 in Aleppo.
Wounded civilians wait in a field hospital after an air strike on August 21 in Aleppo.
People pray during the funeral of a Free Syrian Army fighter, Amar Ali Amero, on August 21.
A man cries near the graves of his two children killed during a recent Syrian airstrike in Azaz on August 20.
A Syrian woman holds her dead baby as she screams upon seeing her husband's body being covered following an airstrike by regime forces on the town of Azaz on August 15.
A Syrian rebel runs in a street of Selehattin during an attack on the municipal building on July 23.
Syrian rebels hunt for snipers after attacking the municipality building in the city center of Selehattin on July 23.
Members of the Free Syrian Army's Mugaweer (commandos) Brigade pay their respects in a cemetery on May 12 in Qusayr.
Syrian rebels take position near Qusayr on May 10.
A Free Syrian Army member takes cover in underground caves in Sarmin on April 9.
Rebels prepare to engage government tanks that advanced into Saraquib on April 9.
Men say prayers during a ceremony in Binnish on April 9.
A young boy plays with a toy gun in Binnish on April 9.
A Free Syrian Army rebel mounts his horse in the Al-Shatouria village near the Turkish border in northwestern Syria on March 16, a year after the uprising began.
Syrian refugees walk across a field before crossing into Turkey on March 14.
A rebel takes position in Al-Qsair on January 27.
A protester in Homs throws a tear gas bomb back towards security forces, on December 27, 2011.
A man stands under a giant Syrian flag outside the Umayyad Mosque in Damascus on December 24, 2011.
A member of the Free Syrian Army looks out over a valley in the village of Ain al-Baida on December 15, 2011.
Members of the Free Syrian Army stand in an valley near the village of Ain al-Baida, close to the Turkish border, on December 15, 2011.
Displaced Syrian refugees walk through an orchard adjacent to Syria's northern border with Turkey on June 14, 2011, near Khirbet al-Jouz.
A Syrian man holds up a portrait of President Bashar al-Assad during a rally to show support for the president in Damascus on April 30, 2011.
Syrians rally to show their support for President Bashar al-Assad in Damascus on April 30, 2011.
A screen grab from YouTube shows thick smoke rising above as Syrian anti-government protesters demonstrate in Moaret Al-Noman on April 29, 2011.
A screen grab from YouTube shows Syrian anti-government protesters run for cover from tear gas fired by security forces in Damascus on April 29, 2011, during the "Day of Rage" demonstrations called by activists to put pressure on al-Assad.
Syrians wave their national flag and hold portraits of al-Assad during a rally to show their support for their leader in Damascus on March 29, 2011.
A woman sits by the hospital bed of a man allegedly injured when an armed group seized rooftops in Latakia on March 27, 2011, and opened fire at passers-by, citizens and security forces personnel according to official sources.
Syrian protesters chant slogans in support of al-Assad during a rally in Damascus on March 25, 2011.
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