The British police suspended an official on Friday after a video surfaced that detained a man in North London using techniques that "were not taught in police training".
Recordings released on social media showed the man being held on the ground and shouting, "Get off my neck."
Steve House, deputy commissioner for the group, described the footage as "extremely worrying".
"I am very concerned about some of the techniques used – they are not taught in police training," he said in a statement.
"An officer has been suspended and another officer has been removed from operational service but not suspended at this time. This decision is still under review," he added.
Officers were called to a fight on Thursday and arrested a man at the scene of the crime on suspicion of having an affair and possession of an offensive weapon, the troops said.
The arrest was reminiscent of George Floyd, whose death by the US police in May sparked worldwide protests against Black Lives Matter.
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