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There has been intense fighting in the Mannar area on the northwest of the island in recent weeks.
Updated Military spokesman Udaya Nanayakkara said police had been searching a house in Ibbanwatte in the Aluthmawatha area around 6.10 am, when the bomb was triggered.
At least four police policemen were among the injured he said, while four others were also injured.
At least seven were admitted to hospital, police said.
The security media centre said a search had turned up a pistol, an ammunition magazine and four bullets.
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Sri Lanka's capital is under tight security following a spate of bomb attacks by Tamil Tiger guerillas this year.
Attacks on civilian targets came as the military stepped up its campaign on Tiger-held areas in the north.