Three Irish U.N. peacekeeping soldiers were killed Tuesday when their vehicle ran over a land mine in south Lebanon, an Irish officer said. He said they were killed near the village of Brashiet on the edge of Israel's self-declared security zone. In Jerusalem, a U.N. official at headquarters in Naqoura told Reuters by telephone that the soldiers drove their truck over the mine while on a routine patrol. "We don't know who planted the mine or why. We have sent out a team to investigate," said Patrick Keogh, operations officer for UNIFIL. He said two of the soldiers died immediately and a third was pronounced dead on arrival at a U.N. hospital.