The Territorial Support Group (TSG) (or CO20) is a Central Operations unit of London's Metropolitan Police Service, that specialises in public order containment among other specialist policing. The TSG is a uniformed unit of the MPS that replaced the controversial Special Patrol Group in 1987, TSG units patrol the streets of the capital in marked police vans, officers can be identified as TSG from the distinctive 'U' in their shoulder numbers.

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