The other churches were in the cities of Colombo, the capital, and Batticaloa. The Israeli leader, in a statement released on Sunday, said that "Israel stands ready to assist the authorities in Sri Lanka at this hard time".
A statement released by the President's Media Division (PMD) said the decision was taken to ensure the safety of citizens and the president had also declared April 23 a National Day of Mourning.
Security forces stand guard around St. Anthony's Shrine on Sunday.
Sri Lanka has named the local Islamist group, National Thowheeth Jama'ath (NTJ), as the chief suspect, for the violence that has sparked local and global outrage.
The government imposed emergency rule at midnight on April 22, giving police extensive powers to detain and interrogate suspects without court orders.
Police have now detained 40 suspects in connection with the attack.
"Many of the dead from the attacks have been taken to the government morgue and relatives on Monday begin the gruesome task of identifying their loved ones".
The sources also revealed that a fourth hotel was targeted in the string of bombings, but the attack failed.
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No injuries were reported.
Meanwhile, police said it discovered 87 low explosive detonators abandoned at Colombo's main public bus station in the business hub of Pettah. "This is a deeply saddening time and we are working with the Foreign Office to support the families of British nationals involved".
All the attacks were carried out by suicide bombers, officials said.
It emerged on Monday morning Danish billionaire, and largest stakeholder in ASOS, Anders Holch Povlsen lost three of his four children in the attacks.
MPs observed a minute's silence in the Commons on Tuesday in memory of those killed in the Sri Lanka terror attacks, with Foreign Secretary Jeremy Hunt calling it a "truly heartbreaking situation".
Police then carried out raids on two addresses and there were explosions at both.
The country's defence minister Ruwan Wijewardene told parliament that "preliminary investigations" indicated that the bombings were in retaliation for deadly attacks on mosques in Christchurch, New Zealand, in March, but gave no further information.
Ethnic and religious violence has plagued Sri Lanka for decades, with a 37-year conflict with Tamil rebels followed by an upswing in recent years in clashes between the Buddhist majority and Muslims.