France car bomb warning as millions of British holidaymakers head abroad this summer

Patrick Calvar, the country’s most senior security officer, said booby-trapped vehicles could be used as the extremist group seeks to wage fresh terror in France, which was rocked by two major attacks last year.

He said: “I am sure that they will move to the level of vehicle bombs and explosive devices and they will thus increase their power.

“They are going to send in squads whose mission will be to organise terrorist campaigns without necessarily mounting assaults that will end with their deaths.”