A car plowed into a crowd of Liverpool fans during a parade celebrating their side's Premier League soccer title on Monday, hospitalising 27 people, with two seriously injured, but police said they did not believe the incident was terrorism-related.

Police said they had arrested a "53-year-old white British man from the Liverpool area," whom they believed to be the driver of the vehicle which struck a large group of supporters who were celebrating in the city in northwest England.

Twenty people were treated at the scene. Ambulance officials said of the 27 taken to hospital, four were children. One child and one adult were in a serious condition. Four people trapped under the vehicle had to be released by fire fighters.

Videos on social media showed people thrown into the air as the car rammed into spectators.

"We believe this to be an isolated incident, and we are not currently looking for anyone else in relation to it. The incident is not being treated as terrorism," temporary Deputy Chief Constable Jenny Sims told reporters.

"My thoughts are with all those injured or affected," UK Prime Minister Keir Starmer said on X, calling the scenes "appalling." and saying that he was being updated about the events.