The move comes over growing fears that member of the Syrian civil defence unit, known as the White Helmets, will be targeted by regime forces when they move into Quneitra province.
US officials say the United States is finalising plans to evacuate several hundred Syrian civil defence workers and their families from southwest Syria as Russian-backed regime forces close in on the area.
Two officials familiar with the plans said on Thursday that the US, Britain and Canada are spearheading the evacuation that would transport members of the White Helmets group to transit camps in neighbouring countries. From there, they will be sent to third countries, including Britain, Germany, the Netherlands and possibly Canada, according to the officials who spoke on condition of anonymity because they were not authorised to publicly discuss the matter.
The officials, and a member of the White Helmets who is due to be evacuated from Quneitra province, said the operation appears to be imminent as the Syrian army continues to gain ground in its latest offensive. The White Helmets, who have enjoyed backing from the US and other Western nations for years, are likely to be targeted by Syrian regime forces as they retake control of the southwest, according to the officials.
The officials said planning for the evacuation has been taking place for some time but accelerated after last week's NATO summit in Brussels.
"These are hard hours and minutes," the White Helmets volunteer in Quneitra said, speaking on condition of anonymity for fear for his life. "This is the worst day of my life. I hope they rescue us before it is too late."
The evacuation is expected to take place from Quneitra, which straddles the frontier with the Israeli-occupied Golan Heights and where the civil defence team is trapped. It is the last sliver of land still outside government control in the region.
Since the government offensive began in June, the area along the frontier with the Golan Heights has been the safest in the southwestern region, attracting hundreds of displaced people because it is along the disengagement line with Israel, demarcated in 1974 after a war.
The Syrian regime is viewed as being unlikely to fire there or carry out air strikes.
Negotiations are also ongoing to evacuate armed rebels and their families who do not want to accept the return of the rule of Bashar al Assad's government to Quneitra, which the rebels have controlled for years. The fighters will be evacuated to the northern part of Syria, where the opposition still holds sway.
Except for that sliver of land, the southern tip of the southwestern region lies along the border with Jordan and the Golan Heights and is occupied by a Daesh-affiliated group. The area is expected to be the target of the next regime advances and the civil defence teams don't operate there.
Not without controversy
The White Helmets are not without controversy. They only operate in opposition-held areas, where government services are almost non-existent and aerial bombings are recurrent. Syrian regime supporters accuse them of being politically affiliated with the rebel groups. The Russia and the Syrian regime have repeatedly accused them of staging chemical attacks in opposition areas, a charge that has never been proven.
They have continued to receive US support even as President Donald Trump presses ahead with his plans to withdraw all American forces from Syria as soon as Daesh forces are routed.
In June, the State Department freed up a small portion, $6.6 million out of some $200 million in frozen funding for Syria stabilisation programs to keep the White Helmets operating through the end of this year.
In other parts of Syria, where regime control has been restored, civil defence volunteers have almost always evacuated to other opposition-controlled areas. It is not clear why this time they will be evacuated out of the country.