CAMPAIGNERS have condemned an “appalling” arson attack on four Jewish community ambulances today, calling for unity against hatred and racism.The incident in Golders Green, north-west London, was being treated as an anti-semitic hate crime by the Metropolitan Police but not immediately as terrorism, the Metropolitan Police said.Detective Chief Superintendent Luke Williams, who leads policing for the area, said investigators are aware of a group apparently claiming responsibility for the attack online, but have not yet verified whether this is true.