BEIRUT — A Lebanese security official says the army is questioning an Israeli Arab who turned up on a beach in south Lebanon after swimming from Israel. The official says the man showed up in a diving suit on a beach in Naqoura after having swum from Nahariya beach in Israel Monday. Investigations were ongoing to determine whether he had entered Lebanese waters by mistake. The official spoke Tuesday on condition of anonymity in line with regulations. The Israeli army said it had no information on the case. Lebanon and Israel are deeply suspicious of each other and remain in a state of war.