He said 11 people had been detained for questioning by police for breaking the curfew as well as for possible involvement with the bombing in Galle, a popular tourist destination located 110 kilometres (70 miles) south of Colombo.
A sailor and a civilian were killed when the Tigers rammed explosives-laden boats into three naval craft and sank them.
A pro-rebel website reported that two Tiger boats successfully went ashore and militants carried out rocket-propelled grenade attacks against the harbour while the suicide bombing was underway.
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Police said they believed four or five Tigers may have escaped after the attack.
The security boost in Galle came amid fears of inter-communal tensions, the officer said, adding that police opened fire and wounded three men Wednesday to prevent rioting between