https://www.cnet.com/news/sri-lanka-shuts-down-social-media-following-deadly-easter-explosions/

The government clamped down on social media to prevent the spread of misinformation following the attacks, the president's secretary, Udaya Seneviratne, told The New York Times. 

"If I don't reply to your messages it is because WhatsApp and Facebook appears to have been shut down in Sri Lanka," local Roshni Fernando tweeted. Fernando told The Washington Post she grew up in London but recently moved to Sri Lanka and lives in the capital, Colombo, one of the cities targeted in the attacks.