A British man who claims he has been fighting in Syria says he will not return until the "black flag of Islam" is flying over Buckingham Palace. The man calling himself Abu Osama said he had been fighting in Syria for 12 months alongside groups such as the al-Nusra Front, although his claims cannot be officially verified. "If and when I come back to Britain it will be when this Khilafah, the Islamic state, comes to conquer Britain, and I come to raise the black flag of Islam over Downing Street, over Buckingham Palace, over Tower Bridge and over Big...