UPDATE 2-Israeli strikes kill 12 in Lebanon, including 5 Hezbollah fighters, source says

The Israeli military said the airstrikes targeted training camps used by elite Hezbollah fighters and warehouses it used to store weapons in the Bekaa Valley region of eastern Lebanon. The airstrikes were the deadliest on the area since a U.S.-brokered ceasefire between Lebanon and Israel last November.

(Recasts with source's account of casualties in Lebanon) JERUSALEM/BEIRUT, July 15 (Reuters) -

Heavy Israeli airstrikes killed 12 people, including five Hezbollah fighters, in eastern Lebanon on Tuesday, a security source in Lebanon said, in what Israel said was a warning to the Iran-backed group against trying to re-establish itself. The Israeli military said the airstrikes targeted training camps used by elite Hezbollah fighters and warehouses it used to store weapons in the Bekaa Valley region of eastern Lebanon.

The airstrikes were the deadliest on the area since a U.S.-brokered ceasefire between Lebanon and Israel last November. Bachir Khodr, governor of the Bekaa region, said seven of the dead were Syrian nationals. Israel dealt Hezbollah heavy blows in last year's conflict, killing its leader Hassan Nasrallah along with other commanders and destroying much of its arsenal.

Israeli Defence Minister Israel Katz said Tuesday's strikes sent a "clear message" to Hezbollah, accusing it of planning to rebuild the capability to raid Israel through the elite Radwan force. Israel "will respond with maximum force to any attempt at rebuilding", he said. He added that strikes were also a message to the Lebanese government, saying it was responsible for upholding the ceasefire agreement.

There was no immediate public response from Hezbollah or from the Lebanese government to the latest Israeli strikes. The United States has submitted a proposal to the Lebanese government aimed at securing Hezbollah's disarmament within four months in exchange for Israel halting air strikes and withdrawing troops from positions they still hold in south Lebanon.

Under the terms of the ceasefire brokered by the U.S. and France, Lebanon's armed forces were to confiscate "all unauthorized arms", beginning in the area south of the Litani River - the zone closest to Israel.