Sri Lankan police on Sunday reported there had been a seventh explosion, a few kilometres south of capital Colombo.
This comes after six explosions ripped through three churches and luxury hotels on Sunday, killing nearly 140 people.
Police say the latest explosion was at a hotel near the national zoo in Colombo.

Six killed in India's Mumbai as rains wreak havoc, disrupt travel
Thousands evacuated from homes in southwest France as wildfire burns
Second Russian attack on Kyiv in less than a week kills 11, wrecks apartments
Folarin Balogun to play for US after FIFA suspends red-card ban
Arab League condemns Israeli demolition of entire neighborhood in Lebanon