Dramatic bodycam footage shows cops repeatedly warning suspect to drop the knife before Brooklyn subway friendly fire shooting

Dramatic police body camera footage shows cops repeatedly warning a deranged suspect to drop his knife — then firing a taser to subdue him — before a “friendly fire” shooting left  cop and two bystanders injured at a Brooklyn subway station.In the stunning footage, cops are shown trailing Derrell Mickles, 37, after he hopped a turnstile at the L line station on Sutter Avenue — then shouting “drop the knife!” and “put the knife down!” on Sunday.When Mickles repeatedly refuses, the officers are shown first tasering him then opening fire.hitting suspect who falls to the floor of the train but appears to barely react to being shot.During the shootout, two innocent bystanders and a police officer were also struck by bullets. ...