Three Sri Lankan Tamil Tiger rebels blew themselves up at sea on Friday after Nordic truce monitors boarded their boat for an inspection, just hours ahead of peace talks set to begin in Germany. Two monitors and a translator jumped overboard to escape the explosion after boarding the boat to investigate weapons, including an anti-aircraft gun, ammunition and hand grenades, officials from the Sri Lanka Monitoring Mission said. ‘‘It was very clearly a violation of the ceasefire. It is clear the LTTE were transporting these weapons,’’ Teitur Torkelsson, a spokesman for the monitors, said. (Reuters)