51 migrants injured in clashes with each other in French English Channel port of Calais

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Migrants massing at France's English Channel port of Calais have clashed in overnight battles that left 51 injured — one seriously.

Police intervened with tear gas early Tuesday to break up clashes between Sudanese and Eritreans, local government officials said.

It was the third clash in 48 hours between migrants massing in Calais in a bid to cross the English Channel to Britain, their numbers swelling in summer months to more than 1,000.

France and Britain have long tried to dissuade migrants from using Calais as a stepping stone to Britain, and British police have been posted their since 2003.

Migrants' outdoor camps were bulldozed in May. Now, authorities threaten to expel them from two abandoned factories.

A fight broke out early Monday. Another erupted Monday evening.