A video shows US commandos fleeing a town as American-backed Syrian rebels hurled a barrage of insults and abuse at them.

Footage captured a chanting crowd of fighters from the Free Syrian Army (FSA) surrounding US troops in the town of al-Rai near the Turkish border.

One rebel was heard yelling that Americans wanted to 'wage a crusader war' against Syria - showing the intricate web of alliances in the war-torn country, where many of America's allies are fighting each other.

Footage captured a chanting crowd of fighters from the Free Syrian Army (FSA) surrounding US troops in the town of al-Rai near the Turkish border

The clip is thought to be the first documentation of American special forces working alongside Turkish fighters against ISIS.

It shows crowds of rebels yelling anti-American slurs as they surround a line of trucks carrying US fighters.

'Christians and Americans have no place among us,' shouts one man, as the trucks drive away. 'They want to wage a crusader war to occupy Syria.'

Another rebel yells: 'The collaborators of America are dogs and pigs. They wage a crusader war against Syria and Islam. '

The US commandos are not in their traditional gear, but are identified by their round helmets and American weapons.

The confrontation took place in al-Rai - which was captured by Turkish-backed Syrian rebel groups from ISIS.

It shows the tensions within Syria, where US-backed rebel groups still feel opposed to American actions. It is not known if the conflict was a spontaneous confrontation or ordered by senior FSA figures.

One rebel was heard yelling that Americans wanted to 'wage a crusader war' against Syria - showing the intricate web of alliances in the war-torn country, where many of America's allies are fighting each other

The clip is thought to be the first documentation of American special forces working alongside Turkish fighters against ISIS

Senior fellow at the Middle East Institute Charles Lister, said the incident was triggered when FSA rebels accused the Americans of supporting Kurdish militia fighters - the People's Protection Units (YPG).

'Heated tempers and YPG relations aside, this was a big mistake by FSA. But it does go to show the diplomacy now required to make it work,' he told The Telegraph.

Turkey, which launched a military incursion into Syria in late August, has been backing the FSA.

Turkey is opposed to the YPG and its FSA delegates have fought with Kurdish fighters - even though they are both US allies fighting against ISIS

It comes as Turkey said on Friday that a ground operation could force out Islamic State extremists from their de facto capital of Raqa in Syria if it was supported by coalition air forces.

Speculation has grown of a possible joint Turkey-US operation to seize Raqa and possibly IS-held Mosul in northern Iraq after President Recep Tayyip Erdogan revealed he had discussed the issue with US counterpart Barack Obama at the G20 in China.

'If coalition forces give air support and our special forces take part, it is possible to be successful in clearing Daesh (IS) from Raqa and Mosul,' Turkish Foreign Minister Mevlut Cavusoglu said at a joint press conference with NATO chief Jens Stoltenberg.

The confrontation took place in al-Rai - which was captured by Turkish-backed Syrian rebel groups from ISIS.

The NATO secretary general was one of the top Western officials to visit Turkey in the wake of the July 15 attempted coup aimed at bringing down the Turkish government.

Cavusoglu referred to the capture of the border town of Jarabulus in northern Syria last month as an example of how a ground operation could remove jihadists.

Pro-Ankara Syrian opposition fighters - the FSA - captured the town in just a day with Turkish support and are now pushing deeper into Syria.

'After the successful operation in Jarabulus, it was an example of how the Free Syrian Army could do certain things' with international support, he added.

The minister did not say from where the air support could come for a Raqa operation but Turkey hosts US warplanes at its Incirlik base.

Ankara launched its most ambitious military operation in Syria on August 24 against ISIS as well as a Syrian Kurdish militia linked to its own separatist rebels who launch attacks in Turkey.