The death toll in "Islamic State of Iraq and Syria" (ISIS) suicide bombings and raids in Syria's Sweida city passed 250 on Thursday (July 26th), AFP reported.

Four suicide bombers had struck the city on Wednesday, while other ISIS fighters attacked villages to its north and east with guns and explosives.

The death toll reached 252 on Thursday, 139 of them civilians, according to the Syrian Observatory for Human Rights.

The others killed were pro-government fighters or residents who had taken up arms to defend their villages.

At least 63 extremists died carrying out the assault, the Observatory said.

News websites in Sweida alleged that some of the extremists who took part in Wednesday's attack had been given safe passage out of the Yarmouk refugee camp in the southern outskirts of Damascus.

The last ISIS fighters in the camp were bused out with their relatives in May to desert territory still held by the group.

The Sweida websites posted images that purported to show ISIS fighters killed in the assault with identification cards showing they were from Yarmouk.

Meanwhile, the Observatory said Thursday regime forces were advancing in neighbouring Daraa province's western countryside, where they had retaken the ISIS-controlled town of Saham al-Golan.

Syrian government forces also raised the country's flag on the frontier with the Golan Heights on Thursday, the Observatory and a pro-government newspaper reported, four years since they were last deployed there.

Regime forces pulled up the Syrian flag over the Quneitra crossing, the main border point with the occupied Golan, said Observatory head Rami Abdel Rahman.