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Asylum seeker 'assaulted on plane' during deportation

8 February 2013 Last updated at 21:38 GMT

An asylum seeker alleges he was assaulted by private security staff on a plane at Heathrow Airport, the BBC has learned.

Marius Betondi from Cameroon says he suffered serious injuries as guards attempted to deport him last month.

The UK Border Agency has launched an investigation into the claims.