Inside the immigrant ghettoes where terror breeds: Concrete warren divided into 'boxes' houses 10,000 Muslims in grim Parisian enclave

"Seven-storey block is where suspect Cherif Kouachi was radicalised

  • It lies in Gennevilliers - just seven miles from the Charlie Hebdo office

  • Half a century ago it was an archetypically French community

  • Now you can walk street without seeing a solitary white Frenchman"