"We believe some migrants are coming back and that 300 to 400 of them are currently in the region. Most of them teenagers or young adults"
By Matthias Blamont
PARIS, Feb 17 (Reuters) - Some 300 to 400 migrants, mostly unaccompanied children, have made their way back to Calais in northern France over the past few weeks in the hope of reaching Britain, non-government associations say.
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