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Around 70 people facing a second night of sleeping rough around the "Jungle" in Calais are being allowed into the camp's church and school, a charity has said.
Volunteers from Help Refugees said they are taking food and blankets to the stranded group, around half of whom are thought to be children.
Earlier on Thursday Home Secretary Amber Rudd reminded French authorities of their duty to "properly protect" children, amid reports youngsters were forced to sleep rough around the smoldering remains of the camp on Wednesday night.
Home Secretary Amber Rudd has spoken to French counterpart Bernard Cazeneuve "to stress the need for children who remain in Calais to be properly protected" after dozens of youngsters were forced to sleep on the roadside of the Jungle camp.
Unaccompanied minors are reported to be being pushed back from the "Jungle" camp in Calais.
The charity Help Refugees estimated that there were between 100 and 200 children left in the camp on Thursday morning waiting to be processed.
In response to police attempts to move them away from the camp, the minors stopped and one played a drum.
Children are reportedly being arrested in the 'Jungle' camp in Calais, a charity has warned.
Help Refugees said it had received reports of "children are being arrested without explanation" in the camp.
It added all residents must be registered by 2pm and "any minors or adults found without wrist bands by that time will be arrested".
French Authorities have brought in the heavy machinery to scale up the clearance operation in the 'Jungle' camp in Calais.
Refugee charity Care 4 Calais has released images of migrant children sleeping without shelter after an operation to demolish the "Jungle" refugee camp began on Monday.
Some 5,596 people have been evacuated from the camp, and plans are underway to move migrants on to resettlement centres across France.
Fires raged across the camp on Wednesday as French authorities demolished the site.
Charities warned that the fires destroyed safe spaces for children, meaning 40 unaccompanied minors were forced to sleep in a mosque.
Local police subsequently arrested four migrants in connection with starting the fires.
Migrants arriving at France's Calais "Jungle" since demolition of the camp will not be resettled by the local authorities, the government representative in Calais said.
A resettlement centre that has been sending migrants on to reception centres across France as part of the shutdown operation was now closed, Prefect Fabienne Buccio said.
"It is not Calais' role to receive all the migrants of Europe. We do not want to create a vacuum. We have asked (those newly arrived) migrants to disperse."
Earlier in the day, a group of about 100 migrants, mainly young people, were seen filing past a group of riot gear-clad police who have been overseeing the camp clearance since Monday.
French officials have said the rate of demolition at the Calais "Jungle" migrant camp will be scaled up today.
Larger machinery will move in after authorities declared the clearance of the camp complete, with 5,596 people evacuated since the operation began on Monday.
However, Save The Children said it was "extremely concerned" about minors who had not been registered as the site went up in flames.
Several large fires started tearing through caravans, tents and shelters in the centre of the camp a little before midday on Wednesday, the third day of the operation to clear it.
- ITV News correspondent Sally Lockwood reports
Fires burned throughout the day at the 'Jungle' in Calais as French officials said they had accomplished their mission to clear the camp of all migrants.
But a leading charity warned that there were many unaccompanied minors left at the camp.
Caroline Gregory from Calais Action told ITV News that these children had "no where safe to sleep tonight. It's not safe in here any longer."
Latest ITV News reports
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.