Projectiles launched from Lebanese territory hit an Israeli military position in the Israeli-occupied Shebaa farms early on Sunday, three security sources told Reuters.
The Israeli army said it fired artillery on southern Lebanon on Sunday in response to a shot from the area.
"Israeli artillery is in the process of striking the area of Lebanon from which a shot was fired," said a statement, which was issued shortly before 7:30 am (0430 GMT) and did not give any further details about the attack.
