And cross-border violence, as Israeli and Lebanese troops exchange fire. The conflict has killed at least three Lebanese troops, a reporter and an Israeli officer. Let's see more.

Three Lebanese troops, a Lebanese reporter and an Israeli officer are killed in a cross-border skirmish, the most serious violence along the frontier since a 2006 war.

Witnesses say the Israeli army fired at least seven artillery shells at a Lebanese village after Lebanese troops fired warning shots at Israeli army engineers.

An Israeli helicopter also fired two missiles at a Lebanese army post near Adaissah village, destroying an armored personnel carrier.

There are no signs that the Israeli army is making extensive preparations for a large-scale operation - an early indicator the clash may not spark a wider conflict.

UN peace-keepers, stationed with Lebanese troops in the south, urged both sides to exercise maximum restraint.

The tense border has been relatively quiet since the summer of 2006, when Israel and Hezbollah, which controls much of southern Lebanon, went to war.