U.N. Secretary General Ban Ki-moon said in statement that both sides were, "cooperating with the United Nations ... to ascertain the facts," and he urged both sides to exercise restraint.
Since the 2006 war, the border has experienced only sporadic violence. Israel has responded with airstrikes and artillery fire following a number of rocket attacks and shootings across the border. In the most serious incident, a high-ranking Israeli officer was killed by a Lebanese sniper in 2010 after Israeli forces tried to cut down a tree along the border. Israel responded with artillery fire, killing two Lebanese soldiers and a journalist.
Andrea Tenenti, a spokesman for U.N. forces in southern Lebanon, said the U.N. was informed of a "serious incident" along the border. He said the peacekeeping force UNIFIL was in contact with both the Lebanese and Israeli armies, and that they were cooperating.
"The incident happened on the Israeli side of the blue line," he said, referring to a U.N.-drawn line demarcating the border between the two enemy states. He gave no further details, saying UNIFIL was still investigating.
The 2006 war broke out after Iranian-backed Hezbollah guerrillas crossed into Israel and captured two Israeli soldiers. The ensuing month-long conflict killed about 1,200 Lebanese and 160 Israelis.
Hezbollah, which has an arsenal of tens of thousands of missiles and rockets aimed at Israel, is preoccupied with the war in neighboring Syria, where it is aiding the forces of President Bashar Assad. Israeli officials believe Hezbollah is not interested in opening a new front with Israel at the current time.
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Associated Press writer Zeina Karam in Beirut contributed to this report.