Police not to face charges over killing

 A US grand jury has decided not to bring charges against a white policeman over the killing of a 12-year-old black boy armed with a toy gun. A local prosecutor in Ohio state, Tim McGinty, called the events that led to the death of Tamir Rice a "perfect storm of human error". But he said it was not unreasonable for the officer to fear for his life. Public officials in Cleveland on Monday urged the public to remain calm and to protest peacefully. State Senator Sandra Williams said any unrest would hamper progress but still called the decision a "grave miscarriage of justice". Advertisement The announcement comes at a time when the deaths of black men at the hands of police have sparked a national debate. Rice was carrying a non-lethal pellet gun when police approached him in Cleveland in November 2014, in response to a 911 call reporting a man waving and pointing a gun at people.