Up to 10,000 troops are to be deployed to protect sensitive sites.

France has ordered 10,000 troops on to the streets to protect sensitive sites - half of them to guard Jewish schools – as it hunts for accomplices to the Islamic militants who left 17 people dead as they terrorised the nation.

Farid Benyettou, the man believed to have radicalised the Kouachi brothers involved in the Paris terror attack, has been working since December as a trainee nurse in the emergency services at a Paris hospital where victims of the Charlie Hebdo attack were treated.

Two brothers are suddenly the most wanted men in France, suspected of the armed onslaught on a newspaper office that claimed a dozen lives and horrified this country and much of the world.

New security measures, including retaining information on everyone who takes a flight into or out of the EU, are back on the agenda following the brutal murders in Paris.