A projectile was fired from Lebanon into northern Israel, prompting a retaliation, the Israeli Army said early Monday.
The projectile fell in an open field near a kibbutz, Israel's army said in a statement, which made no mention of casualties.
"In response to the projectile launched from Lebanon into northern Israel earlier tonight, Israeli Artillery forces are currently targeting the source of the launch in Lebanon," the military said.
The attack was not immediately claimed by any group.
Aroldo Lazaro, head of the United Nations Interim Force In Lebanon (UNIFIL), has urged "calm and restraint in this volatile and ongoing situation", the mission said on Twitter.
Israel's northern border has been mostly quiet since a 2006 war against Hezbollah.