Merseyside Police Assistant Chief Constable Jon Roy said the two officers needed medical treatment for injuries to their backs after bottles were thrown at them as they went to help an assault victim in a crowd of supporters at the Pier Head on Friday night.
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In scenes which were described as "wholly unacceptable" in a joint statement by the club, police and Liverpool City Council and "heartbreaking" by the city's mayor, thousands of Liverpool fans ignored lockdown restrictions to gather at the Pier Head on Friday night and mark their team winning the Premier League for the first time in 30 years.
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Deputy chief executive of the North West Ambulance Service Mick Forrest said crews were sent to 34 emergencies around the city's waterfront and 27 patients were taken to hospital, three in a serious condition, while seven patients were treated on scene.
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During the celebrations a firework was launched at the Liver Building, causing damage to the floor of a balcony.
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Mr Roy said: "The crowd largely dispersed by about 1.30am and a short time later officers were confronted by a group of people more than 100 strong who sought confrontation with the police."