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In June 2008, Yang Jia carried a knife, a hammer, a gas mask, pepper spray, gloves and Molotov cocktails to the Zhabei Public Security Branch Bureau and killed six police officers, injuring another police officer and a guard. He was arrested on the scene, and was subsequently charged with intentional homicide. In the following six months, while Yang Jia was detained and trials were held, his mother mysteriously disappeared.