Two Hong Kong police officers were arrested after a video emerged of them beating a man on a hospital trolley, heaping further pressure on a force already facing accusations of brutality after tear gas attacks on protesters.
The footage, recorded in late June and seen on the South China Morning Post site, shows two uniformed officers assaulting the man with batons and holding a cloth over his mouth.
There are no other people in the room as the officers take turns to abuse the patient over several minutes.
Police said the man was under arrest at the time.
"It is clear that the actions committed by the police officers concerned are unlawful," said police spokesman John Tse, adding that police viewed the video for the first time on Tuesday.
