It took place in the immediate area of St. Anthony's Catholic church and national shrine, which was at the center of the Easter Sunday terrorist attacks.
Security officials believed that the group was planning small isolated attacks and did not expect them to pull off an attack of this magnitude.
"A security source told Amaq agency the perpetrators of the attack targeting the citizens of [U.S. -led] coalition countries and Christians in Sri Lanka were Islamic State [ISIS] fighters", the statement said, according to The Independent.
The government on Monday said that a local jihadist group - the National Thowheeth Jama'ath - was responsible for the massacres.
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No group has claimed responsibility for the attacks, but police have so far arrested 24 people - mostly members of the NIJ - in connection with the blasts.
On reports saying that Sri Lanka's police chief Pujuth Jayasundara had issued an intelligence alert to top officers about suicide bombers planning to attack "prominent churches", Wijewardene also confirmed that few officers had the information with them.
Fortunately, no injuries have been reported from this latest explosion.
President Sirisena, who was overseas when the attacks happened, called a meeting of the National Security Council early on Monday. On Monday, the channels on Telegram released images of three suicide bombers said to be involved in the Colombo strikes. "A Maregowda and Mr. H Puttaraju in the blasts in Sri Lanka on Sunday, taking the total number of Indian deaths in the tragedy to 10 as of now", external affairs minister Sushma Swaraj tweeted.
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"Terrorists may attack with little or no warning", the updated travel warning reads.
The United States reported at least four Americans killed - including a child - and the Netherlands raised their toll to three.
The explosions - mostly in or around Colombo, the capital - collapsed ceilings and blew out windows, killing worshipers and hotel guests in one scene after another of smoke, soot, blood, broken glass, screams and wailing alarms.
And as tension remained high, police reported a fresh explosion as they attempted to defuse another suspected bomb found Monday near one of the three churches targeted.
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