An Aussie man has spoken of being at the parade where a car ploughed into a crowd of people celebrating Liverpool Football Club’s English Premier League title win on Monday, UK time.

At least 40 people were injured, including a child with significant injuries, while a British man, 53, has been detained.

Merseyside Deputy Chief Constable Jenny Sims said police believe it is an “isolated incident” and not related to terrorism at this stage.

Know the news with the 7NEWS app: Download today

Footage showed a car — believed to be a Ford Galaxy — swerving through the crowd, with people thrown into the air.

A number of people are heard yelling “kill him” toward the driver.

On Tuesday, Aussie witness Joey Griffin told Sunrise hosts Natalie Barr and Matt Shirvington he was nearby when it happened.

“Honestly, it doesn’t feel real,” Griffin said.

“I was at the pub where it happened maybe three hours beforehand, before I headed down to the bus parade.

“We were a street away when it happened.

“People were telling us that someone has driven through the crowd. No one really believed it.

“It started to get real when we heard the ambulances and the police running.”

Griffin said he was still shocked as to how the car got in there, considering how many people were on the street.

“Well, there was a lot of people running away from the scene and getting out of there and everyone was telling everyone to leave and whatever,” Griffin said.

“It went from being the best day ever to no one was speaking. People were crying. It was horrible.”

Griffin said he heard rumours a 12-year-old had died but that not confirmed.

He said his father had been messaging him.

“I spoke to my family. I let them know I was OK,” he said.

“My dad text me early in the morning.”

British Prime Minister Keir Starmer called the scenes “appalling”.

“My thoughts are with all those injured or affected,” he said in a post on X, adding he was “being kept updated on developments”.

It had been a particularly joyous Monday for Liverpool supporters, celebrating the Reds’ title in a proper manner denied to them five years ago.

Liverpool last finished atop the Premier League in 2020, in a season derailed by the COVID-19 pandemic. There was no victory parade to toast that title-winning club.

The club is no stranger to tragedy, with the 1989 Hillsborough disaster still burned into the memory of Liverpool supporters.

Liverpool’s FA Cup semifinal match against Nottingham Forest on April 15, 1989, was stopped due to a crush of fans at Hillsborough Stadium in Sheffield.

Nearly 100 Reds supporters died in the worst sports tragedy in English sports history.

Liverpool City Councilman Liam Robinson referenced the collective unity of the city in the face of tragedy.

“Liverpool is a city with a proud history of coming together and supporting each other during challenging times,” he said.

— With MSNBC