Analysis from the BBC's Asia online editor, Samanthi Dissanayake:

Politicians in Sri Lanka are at pains to restrain speculation about who could be behind these events, and are urging people to limit any information to the evidence released by official sources. Every statement is a message to the country to focus on mourning the tragedy and not turn to blame.

For many Sri Lankans the attacks will be a shocking flashback to the decades of violence during the civil war. Ethnic Tamil separatists were pitted against government forces - both sides were accused of brutality and human rights violations. But many people will have never experienced the scale of co-ordination unleashed in just a few hours and right across the country on Sunday.

Sri Lanka was due to mark a decade since the end of that war next month. In that decade, some of the most notable communal violence in Sri Lanka has been against the Muslim minority. Last March anti-Muslim riots took root in cities and it only ended after a state of emergency was declared.

The government said it restricted social media in the immediate aftermath of Sunday's attacks, and the repeated calls to ensure peace and stability are clearly aimed at trying to stem any discord that could arise as emotions run high.

Australia's PM Scott Morrison adds that a further two women, both with dual Sri Lankan-Australian citizenship, were injured, but are in a stable condition.

One was treated for shrapnel wounds, the other for a broken leg, he tells reporters. , external

The women are receiving consular support, says Mr Morrison, without giving further information.

Australian Prime Minister Scott Morrison says two Australians have been confirmed killed in the attacks.They were members of the same family, he says, who were living in Sri Lanka.

There are no further details.

Peter Michael Fernando lives close to St Anthony's church in Colombo. He was asleep when the bomb went off and said his bed vibrated with the ferocity of the blast.

He told the BBC's Ayeshea Perera he can never un-see what he saw inside the church, including the bodies of children. It’s in his blood now, he says.

This map shows the extent of Sunday's co-ordinated attacks in Sri Lanka.

Three churches were bombed almost simultaneously as they were hosting Easter services. They were the St Anthony shrine in Colombo, St Sebastian's church in Negombo and in Batticaloa, the Zion church.

Three luxury hotels in Colombo - the Cinnamon Grand, the Kingsbury and the Shangri-La. There was also an explosion close to the Deliwala zoo to the south of the capital, and in a residential district.

Police say they also dismantled a "homemade" device on the road to Colombo's main airport.

New images have emerged of the inside of the bombed St Sebastian's church in Negombo. Investigators are picking through the debris looking for evidence to piece together what happened there on Sunday, when the bomb went off.

Image source, Reuters

Image source, Reuters

Image source, Reuters

Image source, AFP

The BBC's Ayeshea Perera is at St Anthony's church in Colombo - the site of the first blast. Church officials told her the clock on the tower stopped from the force of the blast at the exact time of the attack 08:45.

If you're just joining, this is our live coverage of the aftermath of devastating attacks in Sri Lanka on Sunday.

Many details are still emerging, as the authorities appeal for calm and patience from a country in shock.

Here is what we know so far:

• Three churches were attacked, in Colombo, Negombo and Batticaloa - they were all packed with Christians celebrating Easter Day
• Three luxury hotels the capital were also hit
• At least 290 people, including many foreigners, are now confirmed to have died - that figure leaped up early on Monday morning

• More than 500 people were injured
• Police have 24 people in custody, but no group has said it carried out the attacks
• Government ministries are holding emergency meetings
• Officials will be investigating whether intelligence reports of pending attacks were missed.

Four Sri Lankan staff members who were working at the Taprobane restaurant in the Cinammon Grand died in the attacks, a hotel spokesman confirmed.

"It was a busy morning. It's Sunday morning during buffet breakfast so it's one of our busiest periods," the spokesman told the BBC.

"They were servers at the restaurant. One of them was working at the live food stations making hoppers [a Sri Lankan pancake]."

They have been identified only as Shantha, Sanjeeewani, Ibrahim and Nisthar.

The US State Department has issued a new cautionary note for travel to Sri Lanka, external, saying: "Terrorist groups continue plotting possible attacks."

It warns that "terrorists may attack with little or no warning" and target tourist locations, transport and other public areas.

Abuja Subasinghe is a nurse. She says St Anthony's shrine is her life.

"This is where people come and cry in secret," she told the BBC. "I sit here for hours seeking solace."

She came down to the church on Monday morning because she felt it was the least she could do.

"Why have they done this to a place like this?"

The Press Trust of India reports at least six Indians have been killed in the carnage.

• External Affairs Minister Sushma Swaraj identified three of them on Sunday as Lakshmi, Narayan Chandrashekhar and Ramesh.
• Chief minister of Kerala identified, P S Rasina, 58 and from the state, as one of the dead

• The Indian High Commission in Colombo identified two as K G Hanumantharayappa and M Rangappa

The BBC's Nick Beake has tweeted this video from outside St Anthony's church in Colombo.

Prabhath Buddhika lives near St Anthony's church. He told the BBC's Ayeshea Perera that he heard the explosion on Sunday, and ran to help.

Inside, he saw the bodies of children. He said he shut his eyes and cried.

Prabhath is Buddhist, but says all religions believe in the power of the church.

"The people who did this are not human. But this is no ordinary church. It is powerful. They will pay."

This is the scene right now at St Anthony's church in Colombo. Security is high but crowds are gathering as well.

Image source, bbc

The Colombo Stock Exchange will not operate as normal on Monday morning.

“The SEC in consultation with the CSE will perform an ongoing assessment of the conditions necessary for an orderly conduct of the market, and will issue further communications as appropriate,” it said in a statement.

A man in Negombo has told AFP that he and his wife had wanted to attend mass at St Sebastian's church in Negombo on Sunday.

"But it was so crowded there was no place for me. I didn't want to stand so I left and went to another church," said Dilip Fernando.

The decision may have saved their lives, as a bomb was detonated during that mass.

Some of Mr Dilip's family were inside. They survived, but believe they saw the bomber enter.

"At the end of the mass they saw one young man go into the church with a heavy bag. He touched my granddaughter's head on the way past. It was the bomber."

Image source, Reuters

An armed guard stands outside St Anthony's shrine in Kochchikade, Colombo, one of the three churches attacked on Sunday.

The colonial era church is Roman Catholic, but is seen as a holy place by people from several religions, who come to it to pray in front of a statue of St Anthony which is believed to have miraculous powers.

Image source, Reuters