COLOMBO, Sri Lanka - Three Tamil Tiger rebels were killed in a clash with the Sri Lankan navy on a northern islet, the military said on Sunday. The rebels were killed Saturday evening on the island of Kayts, west of the Jaffna peninsula, an official at the Media Center for National Security said on condition of anonymity, citing policy.On Friday, the navy said it destroyed a rebel boat that attempted to enter a base near the island. The navy searched Kayts on Saturday and four Tiger rebels were killed in an ensuing sea battle, it said. Two bodies were recovered.