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Large swathes of Liverpool's city center were put on lockdown as police reacted to a major incident after a car ploughed into dozens of people on Water Street.
A total of 47 individuals were injured, including four children.
It is understood that Merseyside Police had an armed presence in the city center due to the size and significance of Liverpool's title-winning parade.
In the past, armed police have been stationed at city events such as the Labour Party Conference at ACC Liverpool, the Grand National, and even Liverpool's Christmas Markets.
Merseyside Police confirmed the arrest of a 53 year old white British man from the Liverpool area in connection with the incident.
I know people will understandably be concerned by what has happened tonight.
"What I can tell you is that 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 currently being treated as terrorism.
"We would ask that people refrain from sharing distressing footage from the incident online and please share any information directly with our investigation team."
My fire crews will maintain a visible and reassuring presence in the coming days and weeks."
Liverpool's leader of the council, Cllr Liam Robinson, made an appeal: "I would appeal for people please not to share the horrifying footage of the incident on social media - please if you have information forward it to Merseyside Police to help them with their investigation."
"We won't be commenting any further but will provide relevant updates as and when we know more and it is appropriate to