The toll in the eight coordinated bomb blasts that rocked Sri Lanka during Easter celebrations rose to 290, police said on Monday.
Police spokesperson Ruwan Gunasekara told The New York Times that 24 people have been arrested in connection with the deadly explosions in which nearly 500 people were injured on Sunday.
Sri Lankan Prime Minister Ranil Wickremesinghe told the reporters that the authorities had prior "information regarding a possible attack" before the bomb blasts ripped through churches and hotels in Colombo and two other towns in the island nation.
"While this goes on we must also look into why adequate precautions were not taken," Wickremesinghe was quoted as saying by Al Jazeera.
The police said that the investigation will examine reports why the intelligence community failed to detect or warn of possible suicide attacks ahead of the blasts, the worst violence in Sri Lanka since the end of the civil war 10 years ago.
They also said that an improvised pipe bomb found close to Colombo's main airport late on Sunday, was successfully detonated. No group has claimed responsibility for the attacks.
The Prime Minister said, "So far the names that have come up are local," adding that the investigators are looking into whether the attackers had any "overseas links".
According to Sri Lanka's Foreign Ministry, at least 17 people from eight countries, including three from India, were among those who were killed in the serial blasts. The dead included five citizens of Britain, three Danes, two each from China and Turkey and one each from the Netherlands and Portugal, reported CNN.
The ministry said that 19 foreign nationals injured in the attacks are receiving treatment at Colombo National Hospital.
Following the bomb attacks, the Sri Lankan government had imposed a 12-hour island-wide curfew from 6:00 pm on Sunday.
After a discussion with heads of security forces and all other departments regarding the current security situation in the country, President Maithripala Sirisena had announced that the government and private schools would remain closed till Tuesday.
In addition, steps have been taken to temporarily block all social media accounts until the investigations are concluded.
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