'More than 150 people have been killed and hundreds more injured in a string of bomb attacks on hotels and churches as worshippers attended Easter services.
Americans, British and Dutch citizens were among dozens of foreigners killed.
At least six blasts have been reported, three at hotels and three at churches, with the first taking place at St Anthony's Church in Colombo and St Sebastian's in the town of Negombo just outside the capital.
Shortly after those blasts were reported, police confirmed three hotels, the Shangri-La, Cinnamon Grand and Kingsbury hotels, in the capital had also been hit, along with a church in the town of Batticalao, in the east of the country.
The Foreign Office said it was "urgently seeking" information from authorities in Sri Lanka.
A spokeswoman said: "We are aware of reports of a number of explosions in Sri Lanka, including Colombo, and we are urgently seeking information from the local authorities.
"British nationals in Sri Lanka should follow the instructions of the local authorities and check FCO travel advice for updates."
Photos circulating on social media showed the roof of one church had been almost blown off in the blast, with the floor littered with a mixture of roof tiles, splintered wood and blood.
Several people could be seen covered in blood, with some trying to help those with more serious injuries. The images could not immediately be verified.
"A bomb attack to our church, please come and help if your family members are there," read a post in English on the Facebook page of the St Sebastian's Church at Katuwapitiya in Negombo.
According to AFP, Sri Lanka's police chief made a nationwide alert 10 days before Sunday's bomb attacks in the country that suicide bombers planned to hit "prominent churches".
Police chief Pujuth Jayasundara sent an intelligence warning to top officers on April 11 setting out the threat.'
Read more: Sri Lanka church and hotel explosions: More than 150 dead in Easter Sunday bomb attacks
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