NEW : -- Police have released dramatic security camera footage they say shows masked and hooded rioters firing shots at unarmed officers and a police helicopter in the English city of Birmingham . Prince William and Catherine visited Birmingham to meet people affected by the riots . Police say that shots were fired at police and a police officer . Police hope members of the public will help them identify those involved . The violence came amid widespread protests in English cities this year .
NEW : Prince William and Catherine visited Birmingham to meet people affected by the riots . Police say that shots were fired at police and a police officer . Police hope members of the public will help them identify those involved . The violence came amid widespread protests in English cities this year .