A bomb explosion at a police checkpoint killed at least three policeman on Monday, just a day after soldiers repulsed a rebel counterattack in the north that left 111 combatants dead and more than 200 wounded. The explosion near the eastern town of Kalmunai occurred when police stopped a van to search it, said a constable at the Kalmunai police station, 135 miles east of the capital, Colombo. Three policemen were killed and six were wounded, police said. Full Story