LONDON — A family of three, including a small child, have become the first people sent to the U.K. by France under an agreement in which Britain returns migrants who enter the country without authorization and France sends vetted asylum-seekers.

The Home Office said Wednesday that the arrival of the family was part of “critical first steps” in the program dubbed “one in, one out.” Four people who arrived in Britain by boat from France were flown back to France in recent days as part of the arrangement.

The Home Office did not immediately release any further details about the family of three.

The agreement between the two countries, which was negotiated earlier this year and came into force last month, is aimed at deporting migrants who have crossed the English Channel by unauthorized me

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