MOREK, Syria (AFP) - Hundreds of rebel fighters and their families arrived on Saturday (July 21) in northwestern Syria after their evacuation from a southern province under a deal with the regime, an AFP correspondent said.

Air strikes by regime ally Russia, meanwhile, on a southern militant holdout killed six civilians, a Britain-based monitor said.

The evacuations from Quneitra province, which borders the Israeli-annexed Golan Heights, came after a Russia-brokered agreement struck earlier this week for rebels to cede the territory to the Syrian regime.

Rebel elements who opposed the territorial handover were given the option to leave.

On Saturday afternoon, state news agency Sana said preparations were under way to ferry a second wave of people from Quneitra to the north of Syria.

In the morning, a first wave of around 50 buses carrying opposition fighters and their families reached the Morek crossing on the edge of northwestern rebel-held Idlib province, an AFP correspondent at the scene said.

Near the parked buses in Morek, a woman and five children waited by a cluster of small suitcases, the eldest among them carrying bottles of water and a blanket.

Men with light weapons slung on their backs shared a bite to eat and some water as they stood around waiting.

Several wore scarves wrapped around their faces.

The Syrian Observatory for Human Rights monitor said the first convoy to reach Morek transported around 2,800 people.

They were to be transferred to other buses run by local NGOs, before travelling further north to temporary camps in rebel-held areas in Idlib and Aleppo provinces, the Britain-based monitor said.

"More than half of the evacuees are women and children," Observatory head Rami Abdel Rahman said.

'SIX DEAD' IN AIR STRIKES

The evacuations follow a deadly regime offensive on Quneitra, a thin, crescent-shaped province that lies along the buffer zone with the Israel-occupied Golan to the west.

The Russia-negotiated rebel surrender also saw fighters hand over heavy and medium weapons and the return of government institutions to the area.

Syrian forces launched their southern offensive on June 19, targeting the province of Daraa on the border with Jordan, before turning their attention to neighbouring Quneitra.

With a mix of military power and negotiated surrenders, President Bashar al-Assad's troops this month captured more than 90 percent of Daraa, where protests against him first erupted in 2011.

Regime forces backed by Russia have continued their campaign in Daraa, aiming to retake areas still controlled by Islamic State in Iraq and Syria (ISIS) group extremists, which are not party to the Russia-backed withdrawal deals.

On Saturday, Russian air strikes killed six civilians in that ISIS-held pocket, the Observatory said.

The deadly raids came just a day after strikes in the same area took the lives of 26 non-combatants including 11 children.

On Saturday, clashes between loyalists and militants in the area also killed 13 regime fighters, including eight in a car bombing.

Syria's conflict has killed more than 350,000 people and displaced millions since it began in 2011 with a brutal government crackdown on protesters.