Police have released images of 19 people they want to speak to about widespread disturbances ahead of the Scottish League Cup final in Glasgow.
Violence and chaos broke out in the city center ahead of the match between Celtic and Rangers at Hampden Park on Saturday 15 December.
Footage on social media showed large groups of fans, some wearing Santa hats and face coverings, heading down Argyle Street and setting off fireworks before kick-off.
The force urged anyone who recognizes the people in the photo to do so Contact them.
People who witnessed the chaos downtown are also asked to contact us.
Video taken on the day showed large groups of fans marching in the city center from around 1:00 p.m., accompanied by police.
However, violence soon broke out, with one group pushing down Argyle Street towards Trongate.
Shoppers were seen screaming and running back home to avoid the rush.
Online footage showed one football fan falling to the ground as others ran around him. A short time later, a flame exploded near the entrance to a store.
An officer was then seen using his baton against a number of passing fans.
One shopper told the BBC that they had to seek refuge in a nearby store “for their safety.”
CCTV footage from Gallagher's Bar on Howard Street showed a masked man being punched in the face as he tried to enter the Celtic supporters bar.
Moments later a flare was thrown through the entrance as fans rushed along the street outside.
During the disturbances, a Police Scotland officer was injured after missiles were thrown, and a 26-year-old man was taken to hospital after being seriously assaulted.
Officers were allowed to use stop and search powers, including removing items used to conceal identity.
Action photos/ReutersFlares were later fired during the same match.
Celtic won the cup after winning a 5-4 penalty shootout in their 3-3 draw with Rangers.
First Minister John Swinney condemned the behavior of a “minority of fans” as “completely unacceptable”.
He added: “This has caused fear, distress and anxiety for people who were enjoying their Christmas shopping before the football match.
“It is the responsibility of the clubs to ensure that their fans behave properly.”