A spokesman for the Community Security Trust, an organisation which looks after the safety of British Jews, said: "We are already on a relatively high state of alert due to pronouncements by pro-al Qaeda supporters relating to attacks on Jews, and this adds to the picture of threat." Jules Pipe, Mayor of Hackney, said: "Hackney is a tolerant place and we've never seen anything like this before. Our graffiti removal teams are working with the police to remove it as quickly as possible to minimise any further distress."