A grand jury in the US state of Ohio has declined to bring criminal charges against police officers involved in the fatal shooting last year of a 12-year-old boy in Cleveland, a prosecutor said Monday.The November 2014 death of Tamir Rice -- who had been carrying a replica gun in a playground when he was shot dead -- and the fatal shooting of other African Americans by police triggered the Black Lives Matter movement. across the country."Based on the evidence they heard and the law as it applies to police use of deadly force, the grand jury declined to bring criminal charges," against the two officers involved, including the one who shot Rice, Tim McGinty, the prosecutor for Cuyahoga County, Ohio, told reporters. Tim McGinty said it was "indisputable" that the boy was drawing the weapon from his waistband when he was gunned down either to hand it over to police or to show them that it wasn't a real firearm. But McGinty said there was no way for the officers on the scene to know that.He called it "a perfect storm of human error" but said no crime was committed.The grand jury had been hearing evidence and testimony since mid-October.