How Britain's elite police officers pounce the moment terror strikes

Watch: Embedded with police in the terror attack (Sky) They are front and centre of the fight against violent crime, but the Met's Territorial Support Group (TSG) is also a key unit in the response to terrorist incidents. Sky News has been filming for several weeks with 3 area TSG, based in Romford, east London. Little is ever routine with this elite unit, but today was meant to have been a day of anti-violence patrols in the east London borough of Tower Hamlets. As a convoy of TSG vehicles headed to the scene, regular updates were coming through the officers' radios, indicating events on London Bridge were extremely serious. Sergeant Simon Barrell, in charge of our unit, told me the initial reports are always confusing in the early stages of any major incident and that his officers had to be prepared for anything. The TSG teams gathered on Eastcheap just yards from the north end of London Bridge, the spot where their armed colleagues had confronted and shot the terror suspect.

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