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Terrifying footage has emerged showing the moment Kansas City fans fleeing after rapid gunfire was let off during the Chiefs Super Bowl Parade, with officials now confirming 22 have been injured with nine of them believed to be children.

Two gunmen opened fire inside Union Station moments after the team including Travis Kelce and Patrick Mahomes left the stage on what should have been a triumphant day for the city following the Chiefs victory on Sunday.

New video has since emerged showing what sounds like rapid gun shot fire being let off at the parade.

Other footage shows the moment a suspect is tackled by Chiefs fans, with one woman seen picking up what appears to be an assault rifle.

The group hauled the alleged gunman to the ground and then shouted 'we got the gun.' The men held down the suspect until cops arrived to detain him.

TMZ reported that 11 children were taken to hospital, nine of which have gunshot wounds. Police have since confirmed that they have detained three people.

In a press conference in the last hour, Police Chief Stacey Graves said: 'We are working to determine if one of the three are the one that was in that video, where fans assisted police.'

Graves also said that firearms were recovered following the shooting, saying: 'We have recovered firearms. I don't have a number for you or a caliber.'

No charges have been announced, and police said no motive has been determined. Police have referred to the people in custody as being detained.

While Kansas City Fire Chief Ross Grundyson said that eight victims had immediately life threatening injuries.

Police evacuated the train station as huge crowds fled in panic after the shots rang out, with up to one million people expected to have descended on Kansas City for the parade.