Sri Lanka Police tell CNN the death toll has now risen to 321 in the Easter Sunday bombing attacks.
CNN's Will Ripley is at St. Anthony's Shrine in Colombo, the scene of one of Sunday's bombings. It remains an active crime scene and the interior is so badly damaged that investigators haven't been able to examine it all yet.
Ripley spoke to Fr. Jude Fernando, the administrator of the holy site, who said that when the blast went off around 8.45 a.m., he was in his office and just about to walk into the church.
"I came inside the church and I saw people screaming, crying and I started, with the help of the community, and staff and priest, to send each and every one to the hospital," he said.
He said the church was packed because it was Easter Sunday -- around 1,000 devotees were in attendance, he estimated.
Fernando appealed to Sri Lankan Christians to "please be calm and quiet and pray, because our God is not a god of revenge, he's a god of love, he's a god of peace... let's follow our master and spread the good news.
"Continue to pray for one another, and don't do any harmful acts," he said.
Watch the video here.
South Korea joined the US, Australia and China today in cautioning its citizens about travel to Sri Lanka.
The country's Ministry of Foreign Affairs raised the Sri Lanka travel-alert level to "highly cautious."
"We ask our citizens who are residing in Sri Lanka to take extra caution and our citizens who plans to travel the region to carefully consider the need to travel," it said.
From CNN’s Jake Kwon in Seoul
Global headlines about the attacks will have likely delighted the perpetrators, said Anne Speckhard, director of the International Center for the Study of Violent Extremism, who also noted that the coordinated explosions fit the "ISIS and Al Qaeda playbook."
"They want to make a big press presence, a big statement, here’s what we’re capable of doing, here’s how much we hate you, they even like the backlash, they think it unites Muslims to their cause," she told CNN.
Speckhard expressed concern that the attacks could inspire copycat actions.
Funerals at St. Sebastian’s Church were suspended today, after services for 16 victims had already taken place. A priest at the church in Negombo, a city to the north of the capital Colombo, told CNN's Ivan Watson that a funeral procession had been planned, but was stopped. No official explanation has been given.
Bishop Maxwell Silva told Watson that the attacks had changed the dynamic for Sri Lanka's Christian community and that they "have to talk precautions now."
He said that new security measures could include developing "our own security system"—for example, "we can ask people not to bring their purses to church."
"At this time we are speechless. We never had any communal violence," another church official, Father Cyril Gamini Fernando, told CNN.
He said that because police had asked not to have large crowds of people, "I feel there must be a threat," and added that he did feel like a target.
Most of the crowds have left the church grounds now, where the funerals had been taking place.
Inside the damaged building, CNN staff could see police personnel in medical scrubs and surgical masks. There are still police lines still around the church compound.
Information provided by Sri Lankan officials linked Sunday's attack to a small and little-known extremist outfit named National Tawheed Jamath (NTJ).
But, as regional expert Michael Kugelman writes for CNN, "NTJ is no jihadist juggernaut; it's an entity mostly known for defacing Buddhist statues." To pull off such a catastrophic attack, it would have needed help, he argues—but from whom?
Al-Qaeda and ISIS would be logical partners; both have carried out attacks like Sunday's in the past. However, these groups have been badly degraded. They do each boast a South Asia affiliate, with some reach beyond the Afghanistan-Pakistan region where they're largely based.
But they're not known to have a track record, much less a footprint, in Sri Lanka.
Furthermore, had al-Qaeda or ISIS been involved, one would have expected a claim of responsibility. There was none. For that matter, NTJ didn't claim credit either.
Several other things don't make sense. In recent years, Sri Lanka has seen some anti-Muslim sentiment, fueled by Buddhist extremists, and it has led to episodic attacks on Muslim targets. But Sri Lanka doesn't have a history, past or present, of problems with Islamist radicalization.
Furthermore, if an Islamist radical group wants to stage an attack in Sri Lanka, one would expect it to hit out at the Buddhists with whom Muslims have clashed -- and not the Christians targeted in Sunday's strikes.
Read the rest here.
As the bombing investigation deepens, Sri Lankan politicians are pointing fingers.
The country remains split by a political crisis that began last year, when President Maithripala Sirisena attempted to remove Prime Minister Ranil Wickremesinghe, writes CNN's James Griffiths in a report on the country's current state of confusion.
Paikiasothy Saravanamuttu, executive director of the Colombo-based Centre for Policy Alternatives think tank, said that "very clearly the disagreements and tension between the president and prime minister has affected this (situation), to what extent it has needs to be uncovered in the investigation."
"But clearly all of this should be put aside and there should be unity in terms of investigating and bringing the perpetrators to account," he said, adding that the continued disputes were "really quite absurd."
"The government really needs to close ranks and put up a united front, but the damage I think has been done."
A senior Bangladesh foreign ministry official told CNN that a relative of Prime Minister Sheikh Hasina died in one of the hotel blasts in Colombo.
Eight-year-old Zayan Chowdhury—Hasina's cousin's grandson—was eating breakfast with his family at a restaurant in the Shangri-La Hotel when the attack took place, said Preeti Rahman, senior official at the Bangladesh Foreign Ministry. Chowdhury died in the blast.
The boy's body will be flown to Bangladesh on Wednesday.
Referring to the same death, British MP Tulip Siddiq -- PM Sheikh Hasina’s niece -- on Monday tweeted saying "I lost a relative today in the Sri Lanka attacks."
A team from the Australian Federal Police (AFP) will be joining Sri Lanka's investigation effort, said Australian Prime Minister Scott Morrison to CNN affiliate Seven Network.
"AFP and our people are now joining the investigation efforts," he said. "We've made those offers and they’ve been responded to and so we’ll be assisting wherever we can with these investigations."
He told the Sunrise morning show earlier on Tuesday that there were "still no clear details and evidence of who was responsible" for the attack.
"But we know who was targeted -- Christians going to worship on Easter Sunday and many others... particularly westerners but many, many, many Sri Lankans going about their daily business.
"It has been a terrible period of time for Sri Lanka."