Police investigating 'arrest' videopublished at 12:15 British Summer Time 31 July 2017
West Midlands Police says officers featured in video "relating to arrests" made in Birmingham yesterday will not be on usual duties while an "assessment" of the footage is under way.
The review, the force says, pertains to video circulating on social media. It shows interaction between plain clothes policemen and members of the public.
A statement said: "Whilst an assessment is being carried out by experts in the Professional Standards Department, the officers featured in the footage will not be deployed on usual duties.
"We are continuing to gather as much information as swiftly as possible to understand exactly what has happened.
"As always, we are treating this matter seriously."