US State Department spokesman Matthew Miller has said that Washington is "concerned by the reports that civilians including two journalists were killed in Lebanon" on Tuesday.

"We have made clear we don't want to see the conflict in Gaza spread to Lebanon. That has been one of our top priorities," he told reporters in Washington.

Since the cross-border exchanges began, at least 100 people have been killed on the Lebanese side, according to an AFP tally, most of them Hezbollah combatants but including at least 14 civilians, three of them journalists.

On the Israeli side, six soldiers and three civilians have been killed, according to authorities.