A police force are investigating after footage of an officer punching a man in the face was published on social media.
Avon and Somerset Police have now released their own bodycam footage of the incident in Yeovil.
The officer can be heard to say "let go of my arm", before giving the man a countdown.
- Warning. Potentially distressing images.
Avon and Somerset Police say they were called shortly before 5pm yesterday (May 31) to a man acting aggressively towards their staff.
They added the man appeared to be in mental health crisis and officers took the decision to detain him under the Mental Health Act.
The actions of the police officer have been widely condemned on social media.
One onlooker, who filmed the incident on his mobile phone, said he stopped to see what was going on.
Avon and Somerset's Professional Standards Department are now looking into the matter.
A former Metropolitan Police officer told ITV News: