Makeshift huts went up in flames on Monday in an angry backlash as workers, guarded by scores of French police, began pulling down tents and shelters in the sprawling migrant camp in Calais.
Police lobbed tear gas in clashes with pro-migrant activists and others throwing projectiles at officers forming a security cordon to protect the tear-down operation.
There were no reports of injuries.
At least three people were arrested, authorities said.
The camp has existed for years in the northern port city of Calais, from where ferries travel across the English Channel and the Eurotunnel rail service operates to Britain.
But now with an estimated 4,000 migrants and refugees in the camp, the situation in Calais has become a flashpoint for Europe's immigration crisis, fuelling far-right sentiment on both sides of the Channel.
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