The leader of one of Syria’s most powerful Islamist rebel groups has been killed in an air strike, according to sources on the ground in the country.

Zahran Alloush, the head of Jaysh al-Islam, is thought to have been killed by Russian air strikes against rebels on the outskirts on Damascus.

The Syrian Observatory for Human Rights cites “leading sources” in Mr Alloush’s rebel group who say that that the commander was killed along with eight of his fellow fighters.

They are believed to have been killed after a meeting in the east of Damascus was targeted by Russian warplanes.

The head of Syrian’s opposition national coalition also said Mr Alloush had been killed and posted a message of condolence to him on Twitter.

Mr Alloush has previously used heavily sectarian language about the Alawite and Shiite ethnic groups and called for them to be “cleansed” from greater Syria.

He was noted as a charismatic leader of the group, and claimed Al Qaeda regional affiliate Al Nusrah front as an ally.

Jaysh al-Islam, also called Army of Islam, controls parts of the Syrian capital Damascus’s suburbs.

The group is in control of Eastern Ghouta, a significant outlying area in the capital region that has been under the control of opposition forces.

The Assad regime’s ground forces has been engaged in an assault on the region to try and claim it back.

Russian air strikes are targeting rebel groups in Syria, including Isis and other groups that have received western support.