After the murder of two NYPD officers on Saturday, the outspoken head of the city's primary police union blamed protesters and Mayor Bill de Blasio for the deaths of Officers Wenjian Liu and Rafael Ramos. "There's blood on many hands tonight," NYC Patrolmen’s Benevolent Association president Pat Lynch said Saturday night, ratcheting up already frigid tensions between City Hall and One Police Plaza. Lynch blamed those who "incited violence on the street under the guise of protest," -- a reference to the swell of demonstrations in New York City and across the U.S.