At least five people were killed and 11 wounded when a woman blew herself up inside a police station in the Sri Lankan capital today.
Police said she detonated an explosive as she was being frisked on her way into the station, on Colombo's main thoroughfare.
It was the first such attack since the government and Tamil Tiger rebels signed a truce in February 2002.
Peace talks to end Sri Lanka's decades-long civil war have been on hold for more than a year but both sides have been observing the Norwegian-brokered truce.
The Liberation Tigers of Tamil Eelam (LTTE) terrorised the capital with suicide bomb attacks during the war, and yesterday marked their "Black Tiger Day", which commemorates their suicide bombers.
There was no immediate comment from the rebels.