Horrifying video footage has emerged of a female police officer and her boss being beaten in a Paris suburb.
The incident took place in the early hours of Monday following an emergency call in Champigny-sur-Marne, an area to the south-east of the city.
The unnamed police officer was filmed by gang members as she was kicked around by the attackers. The footage was then uploaded onto the internet by the group.
At one stage, her colleague appears so badly beaten up that he takes his gun out his holster, but does not let off a shot.
The footage on social media has sparked outrage across France, with president Emmanuel Macron promising to bring the culprits to justice.
Macron said: 'Those guilty of the cowardly and criminal lynching of police doing their duty on the night of December 31st will be found and punished.
'Force will support the law. Honour to the police and full support to all the agents attacked in such a low level fashion.'
The two officers arrived at a house in Champigny following reports of widespread disorder outside the address, where a New Year's party was taking place.
A number of people were turned away from the house, which led to fighting in the street.
When the police arrived at the scene, they too were attacked.
The thugs filmed themselves stamping on the woman, who tried to cover herself as she is relentlessly beaten.
She was the driver of the duty police captain, who was also beaten up, yet this attack was not filmed.
Collagues finally rushed in to help the officers, who were then rushed to hospital.
They suffered concussion and other injuries, but their condition was not life threatening.
The attackers ran into a nearby housing estate after destroying the patrol car, which was turned upside down and left in ruins.
A source said: 'The captain had tried to defend the pair using a tear gas canister, but was badly beaten up.
'At one stage he produced his service weapon, but did not get a shot off. The female officer has been written off work for at least a week, while the captain will be off for at least 10 days.'
French interior minster Gerard Collomb said after the attack: 'I just spoke with the police officers assaulted.
Everything is done to ensure that the cowardly perpetrators of these unspeakable acts are apprehended and sentenced. To attack our security forces is to attack our Republic.'
In the video of the police officer being beaten up, anunidentified woman is using Paris street slang to say: 'The evening has really gone wrong! Goodness! Poor copper!'
The on-duty police patrol car was also vandalised by the thugs in the attack