French authorities declare the Calais migrant camp empty

A worker clears up gas canisters and fire extinguishers inside the makeshift migrant camp known

The makeshift shelters have become a symbol of Europe's migrant crisis - serving as a base for migrants who tried to reach Britain.

French police, meanwhile, say they are still finding migrants in shelters who do not want to leave.

They had vowed to resettle all of the migrants from the camp, known as "The Jungle", before nightfall so that bulldozers could raze the settlement.

Buccio says "there are no more migrants in the camp".

Almost 6,000 people headed to special centers around France over three days or were sheltered in heated containers, spared by the fires, in the camp.

Britain refused to accept the vast majority of them - apart from a number of unaccompanied child migrants now being processed separately - and high fences were built to keep them away from the port traffic, but still they came.

Migrants and officials said the fires that blazed through the camp overnight and early yesterday had been set deliberately, and exploding gas cylinders had caused them to spread.

It comes on the third day of operations by French authorities to remove the camp's inhabitants and demolish the structures. "Lots of people have planned for tomorrow", Abdul Walia, a community leader among the sizeable Afghan population of the camp, said.

Cleaning crews were moving in Wednesday night to clear debris and remove remaining tents and shelters, she said.

An official who asked not to be named due to restrictions on speaking to the media previously said at least 4,014 people had been transferred to refugee centers on Tuesday.

French authorities previously said they would not use force to have migrants register themselves.

Some tents and shelters were set on fire in a last gesture of defiance but the operation was mostly peaceful.

Save the Children said it was "extremely concerned" about children both in camp and those who had not been registered as the camp went up in flames.

'The camp is finally empty, ' Fabienne Buccio told BFMTV on Wednesday.

Naughton added: "Children were running back into the camp to try and get their stuff". 234 children have also been granted entry to Britain. We want to go to England and England only.

He said he had slept on the ground just in front of the containers, with some 20 to 30 other minors, CNN reported.

"There is no more space in the container camp", said Pierre Henry, the group's director. This kind of situation is exactly what exposes children to traffickers and smugglers, and puts them in risky situations without food, shelter and any support.

Some simple provisions are being provided by grassroots charities which have been operating in the "Jungle" for many months.

Some 1,500 are being housed temporarily in an on-site park of specially fitted shipping containers that is now full, according to the group France Terre d'Asile, responsible for their care.