The Met has also authorised additional stop and search powers for police in the area.
Emergency services found an injured man in the shop in Lambeth, but he died at the sceneThe Metropolitan Police said it was called at 17:58 BST on Saturday to reports of a stabbing in Norwood Road, Lambeth.
Officers attended the shop alongside London Ambulance service and the Air Ambulance. They found an injured man inside, but he died at the scene. A statement from the Met added officers believe they know the victim's identity, and are working to inform his next of kin.
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