COLUMBO, Sri Lanka (Diya TV) — A massive coordinated attack on six sites in Sri Lanka, including 3 churches on Easter Sunday, left nearly 300 people dead and more than 500 people injured.

The U.S. State Department says four Americans died. India’s High Commission says at least eight Indians died, including five members of southwest India’s Janata Dal-Secular political party.

Evening curfews are in effect and social media sites were blocked by the government for fear of the spread of misinformation.

Police arrested 24 suspects in a series of raids hours after the attacks, and said 87 additional bomb detonators were found at a bus station.

Sri Lankan officials say suicide bombers carried out each attack. National Thowheed Jamath, a little known Muslim militant group, is the primary suspect. They are believed to have received assistance by an international network.

Both the U.S. and India warned Sri Lanka days before the attack something was brewing.