Two men were injured during an assault in Derry city centre.
Footage has circulated online says it happened shortly after midnight on Waterloo Street on Sunday morning.
Two men were injured in the incident but the injuries are not life-threatening.
One man, aged in his 20s, was arrested at the scene.
However, he was then de-arrested a short time later.
Police have said enquiries are ongoing and they have asked anyone with any information or who witnessed the assault, or who has mobile phone or dash cam footage, to contact them on 101.
