""The video footage that I have seen today and is circulating on social media is extremely disturbing,'' Metropolitan Police Deputy Commissioner Steve House said. "I understand that many viewing the footage will share my concern.''
The police department said in a statement that the two officers were responding to a report of a fight. The statement said the man was arrested on suspicion of affray and possession of an offensive weapon, and has been seen by a police doctor.
"Some of the techniques used cause me great concern,'' House said. "They are not taught in police training."
London Mayor Sadiq Khan raised questions about what happened with senior officers.
"I welcome the fact the incident has been reviewed quickly by the Met and it's right that they have referred it to the IOPC,'' Khan said. "I look forward to a swift and thorough independent investigation, with all decisions made public.
Police in many cities are under increased scrutiny following the death of George Floyd following his arrest in Minnesota on May 25. A police officer who held his knee against Floyd's neck for nearly eight minutes, Derek Chauvin, was charged with second-degree murder.
- AP