A reported Israeli strike in Syria's capital, Damascus, has killed a number of Iran's Revolutionary Guards and wounded others. 

The British-based Syrian Observatory for Human Rights said the strike targeted a building "where Iran-aligned leaders were meeting."  The Observatory's director, Rami Abdel Rahman, said members of Iran's Islamic Revolutionary Guard Corps (IRGC) and pro-Iran Palestinian factions were taking part in the meeting. 

The death toll was not immediately clear. A security source in the regional pro-Syria alliance quoted by the Reuters news agency said four member of the Revolutionary Guards were killed in the strike, but Syria's state news agency reported two senior Iranian military advisers were killed. 

Syria's state news agency SANA meanwhile said the attack "resulting from an Israeli aggression" had targeted a residential building in the al-Mazeh neighborhood.

There was no immediate comment from Israel.

Iran backs several groups that have targeted Israel, including Hamas in Gaza, Lebanon's Hezbollah, and the Houthi rebels in Yemen.