Accusations include excessive use of force, discriminatory and misogynistic comments, and failing to report or challenge inappropriate behaviour, the IOPC said.
The allegations will feature in a Panorama documentary due to air on BBC One and iPlayer on Wednesday. The Met suspended eight officers and one staff member after the BBC contacted it for a response to the documentary’s findings.
IOPC director Amanda Rowe said: “Having advised the individuals they are under investigation we will now be securing initial accounts from them.
“We are treating this matter extremely seriously and have a team of investigators carrying out enquiries.
“Given the volume of CCTV footage and the number of individuals involved, it will take time to obtain and review all of the evidence, however we want to reassure the public that we are working hard to progress enquiries as quickly as possible.”
