Eight blasts were reported, including at three churches in Negombo, Batticaloa and Colombo’s Kochchikade district during Easter services.
The Shangri-La, Kingsbury and Cinnamon Grand hotels and one other, all in the capital, were also targeted.
A national curfew has been put in place “until further notice” and social media networks have been temporarily blocked.
A foreign ministry official has said at least 27 foreign nationals are among the dead.
he suicide bomber detonated his explosives when police entered a house in a northern suburb of the capital Colombo to carry out a search.
* Eighth blast hits the suburb of Orugodawatta in Colombo; Police say it was carried out by a suicide bomber and killed three police officers.
* Sri Lanka attacks ‘truly appalling’: British PM Theresa May
* Death toll in Sri Lanka blasts rises to 160, including 35 foreigners
* No place for such barbarism in our region, says PM Modit