Sri Lankan police on Sunday reported there had been a seventh explosion, the fourth at a hotel, following six reported at hotels and churches earlier in the day that killed nearly 140 people.
The latest explosion to be reported was at a hotel near the national zoo, which is in an area near the capital Colombo.
"There was an explosion in a hotel in Dehiwela near the zoo," a police official told Reuters adding that there were no further details available.
An eyewitness on local TV said he saw some body parts including a severed head lying on the ground near the hotel.
Zoo officials declared the zoo closed after the blast.
More on Sri Lanka blasts
Blasts at Sri Lanka churches, hotels kill 138
Bangladeshis safe in Colombo: High Commission
President Hamid, PM Hasina condemn Sri Lanka attacks