Beirut: At least 25 Syrian rebels were killed in a failed attack on a makeshift army base outside the northern city of Aleppo, a monitoring group said on Saturday.

Nine regime forces were also killed in fighting that erupted after several rebel groups launched the attack late Friday, the Syrian Observatory for Human Rights said.

Three senior rebel commanders were among 25 fighters killed, said the Britain-based monitor.

Syria’s official SANA news agency reported that ‘a number of terrorists were killed and wounded’ by government forces in the west of the city.

The Observatory said sporadic fighting was continuing on the western outskirts of Aleppo on Saturday morning, with regime planes carrying out air strikes and rebels firing rockets on loyalist positions.

Once Syria’s economic powerhouse, Aleppo has been ravaged by fighting and divided between government control in the west and rebel control in the east since shortly after fighting began there in mid-2012.

In early July, two rebel alliance launched attacks against regime forces in the western outskirts of the city, sparking some of the heaviest violence since the country’s war arrived in the city in 2012.

The assaults were largely repelled however, though rebels have continued sporadic attacks.