JERUSALEM — A senior Israeli army official has called for an inquiry into how a Hezbollah member infiltrated a military post in southern Lebanon.

Israeli soldiers were caught by surprise Sunday when a Hezbollah unit attacked their outpost and one gunman managed to enter the base in Israel's security zone.

No serious injuries were reported in the incident, in which the gunman who actually entered the outpost got into a fistfight with an Israeli soldier before escaping.

Army officers later found a grenade — with the pin still in — which the infiltrator had thrown.

Senior Israeli army officers said the Hezbollah fighters may have wanted to steal weapons in addition to harming the soldiers. They also raised the possibility that the Islamic fundamentalist group wanted to kidnap an Israeli soldier, an oft-stated desire of Hezbollah.