A five-minute walk from the Bataclan theatre, the site of the worst Friday massacre in Paris, is the former office of the satirical magazine Charlie Hebdo that now houses a financial business.The magazine's cartoonists, a Paris journalist close to them said that they now operate out of a new, high-security premises, whose location is a closely-guarded secret. Large parts of their work are done online; none has given an interview for months. French plainclothes police, armed with guns, escort staff who are known to the public and thus at higher risk.