Islamic State claims Easter Sunday blasts in Sri Lanka

The Islamic State on Tuesday claimed responsibility for a series of devastating suicide attacks that killed 321 people and wounded more than 500 others in Sri Lanka on Easter Sunday.

"Those who carried out the attack that targeted members of the US-led coalition and Christians in Sri Lanka the day before yesterday are Islamic State group fighters," the terror group said in a statement through its propaganda 'Amaq' news agency, according to the Site Intelligence Group, which monitors jihadist activities.

Seven suicide bombers carried out multiple blasts that tore through three churches and three luxury hotels in Sri Lanka on Easter Sunday, killing 321 people in the country's worst terror attack.

Forty suspects, including the driver of a van allegedly used by the suicide bombers, have been arrested in connection with the attacks which shook Sri Lanka.

Government's spokesman Rajitha Senaratne said local Islamist extremist group called the National Tawheed Jamath (NTJ) is suspected of plotting the blasts.

"All suicide bombers involved in the blasts are believed to be Sri Lankan nationals," said Senaratne, who is also the Health Minister.