Police have yet to charge anyone in connection with an attack on Manchester City’s team coach.
Flares and bottles were thrown directly at the Premier League champions’ vehicle outside Anfield before April’s Champions League quarter final with Liverpool.
A spokesperson for Merseyside Police said that they have been unable to make any arrests despite viewing over 130 hours of footage from the incident.
The force also said officers had “exhausted” their lines of inquiry after “sifting through CCTV, body-worn camera and phone footage provided by members of the public”.
Police said the footage was “either clouded by smoke from flares thrown during the disorder, or didn’t show the faces” of the assailants.
“Unfortunately, several of our officers sustained injuries. It is testament to them that they carried out their duty to ensure the match went ahead.
“This was an act of serious disorder by people, who spoiled what should have been a celebratory event for genuine football goers.
“We are disappointed at this time that no-one has been brought to justice.”
The force condemned the behaviour as “appalling” and have encouraged anyone with information to come forward.