Turkey will search the Saudi consulate in Istanbul later on Monday as part of an investigation into the disappearance of prominent journalist Jamal Khashoggi, a Turkish diplomatic source said.

The only crossing point between Syria and Israeli-controlled territory reopened Monday, an AFP correspondent reported, four years after closing due to the civil war on the Syrian side.

Two United Nations white jeeps crossed into Israeli-controlled territory through the reopened crossing near Quneitra in the Golan Heights after a deal between Israel, Syria and the UN.

Syria said Monday it was waiting for Russia to determine whether a deal creating a buffer in the northwest was implemented, hours after jihadists missed a deadline to leave the zone.

A Russian-Turkish truce agreement reached nearly a month ago for the region of Idlib gave "radical fighters" until October 15 to leave a proposed demilitarised area between government and opposition forces.

Turkey's President Recep Tayyip Erdogan and Saudi King Salman on Sunday discussed the case of missing journalist Jamal Khashoggi in their first telephone talks on the controversy, both sides said.

Amnesty International on Monday condemned the US-led coalition's failure to acknowledge and investigate its role in civilian killings during the battle a year ago to oust jihadists from Syria's Raqa.

A Saudi dissident in Quebec believes the kingdom hacked his phone and listened to calls he had with Jamal Khashoggi prior to the journalist's disappearance.

Shattered ultrasound machines and prosthetic limbs litter the hallways of Raqa's main hospital, still gutted a year after the Islamic State group made its infamous last stand in its Syrian heartland.

Jordan on Monday reopened its main border crossing with war-torn Syria, a key Middle East trade route, after a three year closure, AFP reporters said.

A deadline for jihadists to leave a planned buffer zone around Syria's last major rebel bastion of Idlib passed Monday without any sign they had done so, said the Syrian Observatory for Human Rights.

Britain, France and Germany insisted Sunday that "light must be shed" on the whereabouts of journalist Jamal Khashoggi as they called for a credible investigation into his disappearance.