A police officer is among 17 people who were injured in incidents involving flares during celebrations ahead of Liverpool's final-game title celebrations.
The Reds lifted the Premier League trophy at Anfield in front of jubilant fans after drawing 1-1 with FA Cup winners Crystal Palace on Sunday.
The injuries have prompted a warning from Merseyside Police as hundreds of thousands of fans were expected to descend on the city for the team's open-top bus parade.
Ch Insp Chris Barnes said they want people to enjoy the party atmosphere but urged fans not to use flares.
The force said a quantity of flares were seized and also four drones that were being flown over Anfield in breach of a temporary air restrictions in place over the ground.