Syrian officials have accused Israel of giving military support to what it called "terrorist groups" after air strikes on the outskirts of the capital, Damascus.

Speaking at a news conference, Syria's Information Minister, Omran al-Zoabi, warned that Israeli airstrikes have opened the door to "all possibilities".

Syrian state media said a research centre and other sites had been hit overnight.

Israeli sources said weapons bound for Hezbollah in Lebanon were the target.