(CNN) -- In what could be one of the highest-level defections yet from the Syrian government, the country's military police chief has reportedly left Bashar al-Assad's forces to join "the people's revolution."
In a video posted online this week, a man identified as Maj. Gen. Abdul Aziz Jassim al-Shallal announced that he was joining the popular uprising.
"The Syrian military has strayed from its core mission in protecting the homeland to become nothing but armed gangs that kill and destroy the cities and the villages, carrying out massacres against our innocent civilian population that came out demanding freedom and dignity," he said.
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Al-Shallal had been planning his escape to Turkey for weeks with the help of rebels, said Louai Miqdad, a spokesman for the rebel Free Syrian Army, speaking from Turkey.
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.
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"The last three hours of al-Shallal fleeing the borders were on a scooter," Miqdad said. "This is how hard things can get when it comes to the coordination of the defections of some of the Syrian officers and how the FSA works hard to guarantee their safety and the passageway of their families."
CNN cannot independently verify many claims from Syria, as the government has severely restricted access by international journalists.
If true, it would be only the latest in a rash of high-profile defections from al-Assad's government.
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Manaf Tlass, a brigadier general and a former friend of al-Assad, left Syria's Republican Guard in July. Prime Minister Riyad Hijab has also defected as have a number of soldiers.
The defections, combined with recent gains by rebels on battlegrounds nationwide, suggest that al-Assad is losing his grip on a country that his family has commanded for more than 40 years. But the president has given no indication that he will step down.
Read more: Opposition: More than 100 Syrians killed in bakery attack
Miqdad, the rebel spokesman, said it's in the best interest of Syrian officials to follow al-Shallal's lead.
"We would like to warn everyone who is serving in the Assad military: This is it. The time is near, and the FSA and the Syrian revolution are shifting the balance of power. If they don't defect now and denounce the regime, they will be considered to be traitors and they will have to face trial for the crimes that their troops committed against our people," he said.
"We urge them to defect now and join the revolution, or it will be too late."
Among the 3,300 Syrian refugees who have entered Turkey in the past two days, one was a member of Parliament, Turkey's state-run news agency TRT reported.
The Turkish Prime Ministry Disaster and Emergency Management Directorate said that 147,107 Syrians were staying in Turkey after fleeing Syria. It said a total of 206,954 Syrians had fled, but 59,847 returned home.
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Fierce battle for key city and base intensifies
Months of intense fighting over the city of Maaret al-Numan and the Wadi al-Deif military base came to a head Wednesday, with rebels pushing for control of key government areas, dissidents said.
"If the rebels manage to take over the Wadi al-Deif base and Maaret al-Numan, it could be a severe blow to the regime in the north because it will give the rebels the upper hand in controlling the entire Aleppo-Damascus highway," said Rami Abdulrahman, director of the opposition Syrian Observatory for Human Rights.
He said such victories would be a major strategic gain because rebels would be able to cut off all the reinforcements to regime forces in Syria's largest city and commercial hub, Aleppo.
"Wadi al-Deif is considered to be the main fuel storage for the regime forces and the largest military base in Idlib province. If the rebels managed to cut off the road by taking over the base and the security checkpoints that surround it, the opposition fighters would cripple the regime forces' ability to mobilize their forces not only in Idlib, but in Aleppo as well," Abdulrahman said. "Hundreds of regime forces will be left in disarray to fight on their own without any reinforcement, fuel or food supplies."
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By late Wednesday morning, rebels had announced "the start of the liberation" of Maaret al-Numan, the opposition Local Coordination Committees of Syria said.
But the Syrian Observatory said clashes continued in the city, punctuated by heavy shelling by regime forces. Dissidents also said rebels destroyed five armored vehicles and a tank.
Violence rages across Syria
Regime forces shelled targets in Raqqa province, a region in north-central Syria more sparsely populated than volatile enclaves to the east, an opposition group said.
The LCC said that, of 164 people killed in Syria on Wednesday, 42 died in Raqqa, many of them in Qahtaniya.
The state-run Syrian Arab News Agency blamed violence against civilians in Qahtaniya, including women and children, on an "armed terrorist group." Since the Syrian conflict began last year, the government has blamed people it labels as terrorists for the violence in the country.
In Hama province, citizen journalist Hassan al-Aarg said government shelling in the village of Kafr Zeta killed two toddler boys.
Their mother had laid them down on a blanket when a rocket strike by a government warplane targeted their home, said al-Aarg, who filmed the aftermath.
"I must find them!" their father wailed as he picked through the rubble to collect bits of flesh to place inside a clear plastic bag.
"Oh, God, do you not see?" their mother asked. "Do you not see?"
The twins died about six miles from where more than 100 people standing on line outside a bakery were killed when it was attacked Sunday by warplanes.
CNN cannot confirm the authenticity of the reports because of the restrictions on journalists. The deaths occurred several miles from the bread line pounded by warplanes Sunday.
More than 40,000 people -- mostly civilians -- have been killed in the Syrian crisis since March 2011, according to tallies by opposition activists.
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CNN's Holly Yan and Joe Sterling contributed to this report.
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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 the Syrian government has crossed a "red line" with its use of chemical weapons and announced it would start arming the rebels.
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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.
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Residents read Shaam News newspapers published by the Free Syrian Army in Aleppo on March 2.
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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.
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A rebel fighter fires at a Syrian government position in Aleppo on November 6.
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Rebels hold their position in the midst of a battle on November 3 in Aleppo.
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A Syrian rebel fires at an army position in the Karm al-Jabal district of Aleppo on October 22.
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Syrian army soldiers run for cover during clashes with rebel fighters at Karam al-Jabal neighborhood of Aleppo on October 20.
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A Syrian opposition fighter stands near a post in Aleppo on October 11.
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Wounded civilians wait in a field hospital after an air strike on August 21 in Aleppo.
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Syrian rebels hunt for snipers after attacking the municipality building in the city center of Selehattin on July 23.
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Syrian rebels take position near Qusayr on May 10.
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Syrian refugees walk across a field before crossing into Turkey on March 14.
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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.
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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.
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Syrian protesters chant slogans in support of al-Assad during a rally in Damascus on March 25, 2011.
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