More than 1,200 police and officials in France have begun an operation to clear the “Jungle” migrant camp in Calais.
The camp has been housing some 7,000 people in squalid conditions.
Migrants queued peacefully to be processed, and the first of some 60 coaches that will carry them to refugee centres across France, have now left.
There is concern that some migrants will refuse to go because they still want to get to Britain, and there were some clashes over the weekend.
The demolition of the camp is expected to take place on Tuesday.
The UK has begun to accept some of the estimated 1,300 unaccompanied children from the camp.
The first group without family ties to the UK has arrived in Britain under the “Dubs amendment” rules, which grant refuge to the most vulnerable.
The BBC’s Simon Jones, at the camp, says most people seemed in good spirits despite the slightly chaotic scenes. But one Sudanese man shouted: “Our dream is over.”
The migrants are being placed into separate queues to determine who are in families, travelling alone or whether they are in vulnerable categories.
After processing they will leave for 450 centres in various parts of France and be given the opportunity to claim asylum. If they do not, they could face deportation.
There are 7,500 beds available in centres across France for the Calais migrants.
The first coach left less than an hour after processing began – carrying 50 Sudanese to the Burgundy region, AFP reported.
Officials have predicted that some 2,500 people will leave the camp on Monday.
Children will be housed in the camp’s converted shipping containers while the rest of the Jungle is dismantled.
From Tuesday, heavy machinery will be sent to clear the tents and shelters that have been left behind. The whole operation is expected to take three days.
The French interior ministry said it “does not want to use force but if there are migrants who refuse to leave, or NGOs who cause trouble, the police might be forced to intervene”.
There are reports that British activists from the No Borders group have travelled to the Jungle to try to disrupt the demolition process.
One Afghan migrant at the camp, Karhazi, told the AFP news agency: “They’ll have to force us to leave. We want to go to Britain.”
However, Abbas, from Sudan, said: “I feel very happy. I’ve had enough of the Jungle.”
The Jungle has played host to scenes of both squalor and of violence, as migrants, mainly from Africa and the Middle East, attempt to board lorries bound for the UK, clashing with drivers and police in the process.
Why do migrants want to come to the UK?
Most believe there is a better prospect of finding work. Many want to claim asylum, although others want to enter incognito and remain as illegal workers.
The language issue is also important – many speak English but do not have a European language. Some also have relatives in the UK and that is a big draw.
Some are attracted by a belief that there is better housing and education available.
Some commentators believe illegal migrants also perceive Britain as a “soft touch” for benefits and a better place to find “black economy” jobs, although studies do not necessarily back up this view
A UK-funded wall 1km (0.6 miles) long is being built along the main road to the port in an attempt to deter would-be stowaways. The UK government has not confirmed the cost, but it is reported to have contributed about £1.9m (€2.2m).
Work on the wall, which began last month, is due to be finished by the end of the year.
The Calais camp is just part of a Europe-wide migrant crisis.
Last year more than one million migrants – many fleeing the civil war in Syria – arrived in Europe. Countries struggled to cope with the influx and division arose in the EU over how best to deal with resettling people.
In March, the EU struck a deal with Turkey to try to stop migrants crossing from Turkey to Greece while Balkan nations closed their borders to migrants. As a result, the number of arrivals using the so-called eastern Mediterranean route has fallen.
However, migrants from African countries such as Eritrea and Somalia as well as west African nations such as Nigeria and the Gambia are continuing to attempt the crossing from Libya to Italy.
Some migrants are seeking economic opportunities in Europe – others are fleeing war, instability or authoritarian governments.
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