This is the moment when al-Qaeda linked Islamist fighters enter a town in Syria, narrated by a British jihadist fighter.

The video, which shows a convoy of jihadist insurgents triumphantly celebrating their capturing of the northwestern Syrian town of Jisr al-Shughour emerged yesterday, shortly after their victory.

Just hours after the eight-minute video was filmed, Syrian government warplanes carried out more than a dozen air strikes on Jisr al-Shughour, killing some 20 fighters.

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Victory laps: Two Islamist fighters on a motorbike hold a black jihadist flag often associated with Islamic State, as other fighters hug and cheer in the street of Jisr al-Shughour

The city in the northwestern Idlib province was captured by a terrorist alliance that includes al-Qaeda affiliates Al-Nusra, who released the video, and other groups of Islamist militants.

The video was released yesterday, and is believed to be filmed by a young man who has travelled from the UK to join the fight in Syria.

The man speaks with a British accent as he narrates the video from a car driving into the city.

'This is all new territory, by the mujaheddin, this is all new territory, liberated by the muslimeen,' he says from behind the camera.

'This region has been freed and the oppression has been lifted,' whilst repeatedly calling out Allahu Akhbar [God is great]'

Behind the frontline: The eight-minute video appears to be narrated by a British fighter and shows the al-Qaeda linked group's entry into the Syrian city they have captured

Jisr al-Shughour, a city in the northwestern Idlib province, was captured by a terrorist alliance, comprising al-Qaeda affiliates Al-Nusra, who released the video, and other groups of Islamist militants

Despite the man behind the camera claiming that the Islamist have 'liberated' the city, the inhabitants of Jisr al-Shughour can be seen fleeing on foot and in whatever vehicles available

The man preaches as a 'saviour' claiming the al-Nusra front has 'saved these oppressed people', despite filming the inhabitants of the city as they pack their belongings and flee in long convoys on foot and in cars.

The man, whose face is not shown in the video, claims that the locals are fleeing their homes because of the Syrian government, and that al-Nusra has come to 'free' them.

The day after the town was captured by the Islamist alliance, which did not include fighters from Islamic State, the Syrian government responded in force, a monitoring group said.

The Syrian Observatory for Human Rights said at least 20 air strikes hit the city, which had been one of the regime's last remaining strongholds in Idlib province.

There was no immediate word on any casualties from the latest raids, but the Observatory said the death toll from several dozen air strikes on the city on Saturday had risen to 27.

'At least two civilians and 20 fighters were killed in the Saturday air strikes along with five others whose identities are not yet known,' Observatory director Rami Abdulrahman said.

'The toll is expected to rise after the bombing continued overnight and into Sunday.'

Fighting between rebel forces and regime troops continued south of the city on Sunday, he added, and opposition fighters had captured at least 40 government forces.

'Ten members of the (pro-regime) National Defence Force were captured yesterday by fighters, and today a group of 30 soldiers were found hiding in a building near the southern entrance of the city,' Mr Abdulrahman said.

'The army launched a failed raid to rescue them.'

Calm before the storm: Just hours after the video was filmed, Syrian government warplanes carried out more than a dozen air strikes on Jisr al-Shughour, killing some 20 fighters

Attacks: Smoke rises from opposition-controlled Jobar district of Damascus after a Syrian army fighter jet attacked in a separate airstrike earlier Sunday

Syrian state television said the military had ambushed some militants close to Jisr al-Shughour, which was captured on Saturday for the first time in the four-year conflict by a hardline Islamist alliance including al-Qaeda.

Syrian television also reported that the insurgents had slaughtered civilians, but the Observatory said only government supporters had been detained and no one killed.

'Terrorist groups committed a horrific massacre of civilians after entering Jisr al-Shughour,' state television quoted a military source as saying. It said at least 30 civilians had been killed in the town close to the Turkish border.

But Observatory said combatants had detained government backers and that there was no confirmation so far they had killed anyone.

'If we knew people were killed by them we would report it,' Mr Abdulrahman added. 'No women and children were captured.'

The capture of the town of 50,000 people in Idlib province was the latest setback for government forces in the south and north of Syria.

Insurgents have been trying to push the army out of the few remaining government areas in the province, bringing them closer to Latakia, a coastal province of vital importance to President Bashar al-Assad.

State news agency SANA also said the military had carried out night raids around Jisr al-Shughour and inflicted heavy losses on its enemies.

Last month the hardline Sunni Islamist rebels seized Idlib city, the provincial capital, after forming an alliance that includes Al-Nusra, the Ahrar al-Sham movement and Jund al-Aqsa, but not the rival ISIS group which controls large tracts of Syria and Iraq.