Britain will contribute around 20 million euros in extra funding to boost security at the French port of Calais where thousands of migrants have camped out hoping to cross the Channel, France's minister for European affairs said Thursday.

Britain has already contributed more than 60 million euros and "there will be around an extra 20 million euros ($15.4 million)" Harlem Desir told RFI radio, with the money to be used boosting "security of the access zone to the tunnel... and fighting trafficking networks".

The announcement came hours ahead of a summit between French President Francois Hollande and British Prime Minister David Cameron in the northern city of Amiens, where the Calais crisis will be top of the agenda.