The blast near a suburban train as it arrived at the Fort terminal came just hours after six people were hurt in a hand grenade attack at Sri Lanka's main zoo on the outskirts of Colombo, prompting authorities to boost security.
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Fearing more such attacks, the government put off by three days Monday's opening of a public exhibition marking Independence Day, officials said, adding that it was due to "security considerations."
A police spokesman said the train attack had been carried out by a suspected female operative of the Tamil Tigers, the rebel group fighting to carve out a separate homeland in the ethnic Sinhalese-majority island nation.
"The bombing has all the hallmarks of the Tigers," a police officer at the scene said.
"The head of the woman suicide bomber was found on a platform."
The officer said initial reports indicated that the woman had blown herself up aboard the train, but forensic