A BBC documentary team has filmed hundreds of refugees being held back by French riot police as they attempted to board trucks and other vehicles heading to Britain from Calais.

Producer Darius Bazargan said he had seen men risking their lives on the road as trucks came past at high speed.

An increasing number of migrants have arrived in Calais in recent months intent on reaching the UK.

The Mayor of Calais, Natacha Bouchart, has threatened to blockade the port unless the UK helps to control the problem, claiming the town has been "taken hostage" by more than 1,000 migrants who want to cross the channel.