Witnesses have described the "horrendous" moment a car "rammed" into a crowd of people who were attending Liverpool FC's victory parade following their Premier League win.
Merseyside Police said a number of pedestrians were hit by the vehicle in Water Street, Liverpool just after 18:00 BST. Dozens were injured, two of them seriously, with 27 treated in hospital.
A 53-year-old white British man from the Liverpool area was arrested, police said, adding that he is believed to have been the driver.
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One eyewitness, BBC reporter Matt Cole, said the car missed him and his family "by literally inches".