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Scuffles have broken out in the "Jungle" camp in Calais, less than an hour after French authorities began processing refugees and migrants for the second day.
The spat is thought to have started after unaccompanied children were separated from the main queue and taken to the front.
Someone shouted into a loudspeaker: "Sit down, the door is closed. Stop pushing", while cries of "Help, please help" were heard as people started to panic.
Migrants and refugees believed to be minors could be seen crouching down by metal barriers while police formed a protective circle around them.
The gate to the processing centre was temporarily closed while the chaos continued.
On Monday 1,918 residents left the camp ahead of its demolition.
On Tuesday and Wednesday 85 buses are expected to arrive at the camp to transport residents of the camp to accommodation centres across France.
- Video report by ITV News National Editor Allegra Stratton
The closure of the Calais Jungle is the latest in a series of attempts by French authorities to remove makeshift migrant camps in the area.
Ever since the construction of the Channel Tunnel, northern France has been a magnet for people from around the world.
In 2009, bulldozers cleared the camp that sprung up following the closure of a red cross centre at Sangatte in 2002. Earlier this year, part of the current camp was cleared.
But with the French presidential election upon the horizon, matters are coming to a head. The candidates are vying to come down toughest on the Calais camp, and demand more of the British.
- Video report by ITV News Correspondent Martin Geissler
Hundreds of refugees and migrants have packed their bags on the first day of the mass exodus from the Calais Jungle.
Approximately 2,000 camp residents, including an estimated 300 children, will have passed through the registration centre on the edge of the camp by the end of Monday, a spokesman for the French Interior said.
Crowds carrying rucksacks, holdalls and wheelie-bags, many with scarves over their faces, queued to register for accommodation centres elsewhere after being told they must leave the camp or risk arrest and deportation.
Demolition work on the camp is expected to begin on Tuesday.
Home Secretary Amber Rudd told parliament that closing the 'Jungle' Calais migrant camp is in the UK's national interest and will help better protect borders.
She said the Le Touquet agreement, allowing British officials to check passports in France and vice versa, which has been questioned by some French authorities will be strengthened by the move.
Rudd said: "Clearing the camp isn't just about our legal and moral obligations. It is also in our national interest.
"By clearing the camp, we can help secure the future of the juxtaposed controls as well as playing our part to help those most in need in Calais."
She said that the UK has so far transferred 200 children from Calais to accommodation in the UK, including more than 60 girls, many at high risk of sexual exploitation.
But she said no new children arriving in Calais will be accepted into Britain adding: "It is important we do not encourage more children to head to Calais, risking their lives in the hands of traffickers."
But Shadow Home Secretary Diane Abbott said approximately 1,000 children are still to be processed from the camp.
"The men, women and children in the Calais camp were treated by the French and the UK like pawns but these are real people fleeing war and economic devastation who were living in appalling conditions," she said.
Some 1,631 migrants have so far left the Calais 'Jungle' in 39 buses, ITV News understands.
- Video report by ITV News Correspondent Richard Pallot
The mass exodus of refugees and migrants from the so-called 'Jungle' camp in Calais is under way, with buses starting to disperse hundreds of its residents across France.
Crowds carrying rucksacks and holdalls surged towards the warehouse where processing was taking place as police opened the gates just after 7am UK time on Monday.
People in the queues said they had no idea where they were going but many seemed resigned to leaving the sprawling camp, where demolition work is expected to begin on Tuesday.
Britain should boost its border security as French authorities move to demolish the Calais 'Jungle' refugee camp, an MP has warned.
Conservative MP Charlie Elphicke said the UK must be prepared for a surge in migrants making a last-ditch bid to reach the UK.
He was speaking as an estimated 6,500 people who have been living in the camp began a mass exodus, with refugees and migrants registering for accommodation centres elsewhere in France after being told to leave or risk arrest and deportation.
Meanwhile, Commons Home Affairs Committee chairwoman Yvette Cooper said there were still children in the camp with family in the UK who were now at risk of falling into the hands of people traffickers.
She told the BBC: "That's what's really worrying because once the clearances start we know that there is a significant risk that many of those children and young people just disappear."
Refugees and migrants from the "Jungle" camp in Calais are being asked which region of France they wish to be sent to.
Residents of the camp are then issued with a coloured wristband and assigned to buses to take them to temporary centres across the country.
ITV News Producer Ellie Swinton is in Calais:
On Tuesday 60 buses filled with residents will leave the camp, with more planned for later in the week.
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.