Four migrants have been arrested in connection with starting fires at the Calais "Jungle" camp, local police have said.
Around 10 large fires started tearing through tents, shelters and caravans in the centre of the camp on Wednesday.
Exploding gas canisters could be heard as the fires raged through the camp, with firefighters trying to bring the blazes under control.
Police ushered people out of the camp, with many migrants holding fabrics to their mouths to protect themselves against the black smoke.
Teenagers gathered at a makeshift church in the Calais 'jungle' just days after authorities declared the operation to clear the camp over.
Those still left after the demolishing of the 'Jungle' camp were seen wrapped in blankets as they prepared to sleep rough.
The UK's French ambassador, Sylvie Bermann said the destruction of the Calais 'Jungle' will encourage refugees to seek asylum in France.