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Public Order Policing

May I join the Home Secretary in what she said about the violence and the conduct of the police last week? Unlike some of my hon. Friends, I would not completely rule out consideration of the use of water cannon, although nobody should think of that as a panacea. It is worth recalling that the last time water cannon was used—in Belfast—it was in the face of sustained attack from blast bombs and live rounds. Does she agree that the commissioner's priorities on days such as last Thursday must be good intelligence, effective communication and the earliest possible arrest of those who come looking for violence?