Suicide bombers attack three Christian churches, three luxury hotels and a housing complex.
Flags were lowered to half mast on government buildings, and people bowed their heads and reflected silently on the violence that has caused worldwide outrage.
Security forces stand guard around St. Anthony's Shrine on Sunday.
Sri Lanka is home to about 1.5 million Christians, mostly Catholics.
Police have now detained 40 suspects in connection with the attack.
The curfew imposed after the deadly attacks had been lifted on Monday morning.
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Many gather in churches at risk of attack; countless more will have suffered threats or discrimination", he said.
The wife and sister of the suicide bomber at the Shangri La Hotel were killed in the Dematagoda blast, police told the court.
Police also found 87 bomb detonators at a Colombo bus station. The plurality of the foreign nationals identified as killed so far are from India.
In a tweet, Finance Minister Mangala Samaraweera said the attacks have killed "many innocent people" and seemed to be a "well-coordinated attempt" to create "murder, mayhem and anarchy".
A British father has lost his entire family in the attack.
"The preliminary investigations have revealed that what happened in Sri Lanka (on Sunday) was in retaliation for the attack against Muslims in Christchurch", Ruwan Wijewardene told Parliament on April 23, according to Reuters. More than 500 people were hurt in the attacks, which targeted three churches and three hotels in the capital, Colombo.
Police then carried out raids on two addresses and there were explosions at both.
Interpol said it was deploying investigators and specialists to Sri Lanka, and the US State Department warned of possible further attacks in a travel advisory. The majority religion is Buddhism, followed by Hinduism (12.6 percent) and Islam (9.7 percent), according to the country's 2012 census.