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A thug breaks a police officer's nose as he's being booked for a previous assault, in this shocking CCTV.
Mubarik Cadani suddenly lashes out at PC James McGahan with his elbow, as a custody officer was taking own his details at Hounslow Police Station in London.
Speaking to the man behind the desk, the assailant can be heard shouting: "Say that again", before striking out.
As he's restrained by two other officers in the room, he repeats "say that again" before adding "that I killed my mum?"
Cadani has now been jailed for the "sickening" attack on the uniformed policeman.