A migrant camp in Dunkerque was devastated by a fire on Monday night, as two rival gangs turned on each other, with police firing volleys of tear gas to separate the groups.
At least three people were injured in the brawl, which was said to be between Afghan and Kurdish migrants.
Police fired 21 tear gas canisters to break up the battle at the Grande Synthe camp, home to an estimated 1,200 migrants outside the town. A fire broke out around 9pm, and within two hours much of the camp was destroyed, French press reported. Photos on social media showed buildings ablaze in the night sky.