The Metropolitan Police has suspended nine officers and referred itself to the watchdog following a investigation into Charing Cross station.
The Independent Office for Police Conduct (IOPC) said it was investigating the behaviour of 11 individuals based at the central London station.
The accusations, which feature in a forthcoming Panorama documentary, include excessive use of force, discriminatory and misogynistic comments, and failing to report or challenge inappropriate behaviour, the police watchdog said.
The officers range in rank from police constable to sergeant.
The allegations – which relate to the conduct of nine Met officers, a former Met officer and a serving designated detention officer – are said to have taken place both on and off duty between August 2024 and January 2025.
The IOPC said it had received a referral from another force relating to the conduct of a former Met officer who was previously based at Charing Cross and has since transferred.
The IOPC in 2022 found “disgraceful” behaviour in the ranks at the same police station, including a homophobic, racist and misogynistic Whatsapp group.