NEW : One officer was hurt , but not seriously , police said . About 150 officer was hurt in Tuesday night 's of violence in Northern Ireland . NEW : One youths fired shots and threw bombs at officers . NEW : Police are now trying to identify those involved . NEW : Prime Minister Cameron denounced `` unacceptable '' violence .
NEW : About 150 officer was hurt in Tuesday night 's of violence in Northern Ireland . NEW : One youths fired shots and threw bombs at officers . NEW : Police are now trying to identify those involved . NEW : Prime Minister Cameron denounced `` unacceptable '' violence .