The blasts targeted four hotels, including the Shangri-La, Kingsbury and the Cinnamon Grand in Colombo.
Nearly all victims were Sri Lankan. Dozens of foreigners were also killed.
There were no immediate claims of responsibility for the attacks.
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British Prime Minister Theresa May, condemning what she called the “truly appalling” attacks, said: “The acts of violence against churches and hotels in Sri Lanka are truly appalling, and my deepest sympathies go out to all of those affected at this tragic time.”………………………..