An attack taking place outside of the Grand Hisar Hotel.
The videos showed footage of ultras charging and assaulting fans, leaving several injured.
A self-professed “anarchist” account on X by the name of GFB Bogaz Hooligans boasted about the footage after posting it online.
The account shared a 26-second video of the attacks with the caption: “This is İSTANBUL!”
More than 60 Fenerbahce fans are said to have “swarmed” a group of United fans who had travelled to Istanbul for the match.
One Red Devils fan who was caught up in the attacks told StrettyNews how five fans were “swarmed” by a violent mob.
They said: “About 60 of them swarmed us. “One lad followed me down a street and pretended to help before hitting me a shot into the jaw.”
They added that two members of their group were left injured by glasses and a crowbar.
20 Fenerbahce fans descending upon a smaller group of United fans.
The Fenerbahce ultra account posted a screenshot of an apparent online conversation between them and a so-called United fan.
They said: “A response has been given to the traitors who insulted our religious and national values and gave us a position.”
The pictures detailed how an offensive message was sent to start the exchange before messages of “see you soon”, and “let’s go” were sent before sending the location as the Celtic Irish Pub in Istanbul.
The pub is approximately an 11-minute walk from where one of the attacks took place.
