Migrants once again attempted to break through a police line in the French port city of Calais on Thursday to try and gain access to the Channel Tunnel, in a desperate attempt to reach the UK .

More French police were deployed to the area around the Eurotunnel terminal to try to block them.

Large numbers of migrants have in recent days been scaling fences and trying to get aboard freight trains or trucks bound for Britain.

The Prime Minister will head a meeting of the Government's emergency Cobra committee on the migrant crisis at Calais.

David Cameron, who has returned to the UK after a four-day tour of south-east Asia, will head to Westminster to chair the high-level meeting this morning.

It is understood he will ask ministers and officials to see whether more can be done to address the situation at the port and the Channel Tunnel railhead at Coquelles.