A top envoy from mediator Norway headed for Sri Lanka on Tuesday to meet government leaders and Tamil Tiger rebels, who are pondering whether a new government offer is enough to make them join peace talks. Suspected rebels killed a policeman in a grenade attack overnight in the northern town of Vavuniya, an army spokesman said, in the latest violence to hit the island. The rebels said they killed three members of a renegade faction who attacked them in the east of the country. Full Story