According to reports, few children were among those injured in the incident.

Three persons have been detained in connection with the incident.

The shots were fired west of Union Station.

The parade ended outside the station around 14:00 local time (20:00 GMT) and Kansas City Chiefs players were still on stage when the shots were reportedly fired.

More than 800 police officers were already on the scene to monitor the parade, officials told BBC, including on top of buildings to ensure the safety of those who had gathered to watch.

Kansas City, Missouri Police chief Stacey Graves said firearms were recovered from the site after the shooting incident.

"We have recovered firearms. I don't have a number for you or a caliber. We have recovered firearms," she said during a news conference as quoted by CNN.

She said the motive of the incident is still not clear.

Kansas City radio station KKFI says DJ died in the shooting incident

Kansas City radio station KKFI confirmed that DJ Lisa Lopez-Galvan died in the shooting incident during the parade.

In a Facebook post, the radio station wrote: "It is with sincere sadness and an extremely heavy and broken heart that we let our community know that KKFI DJ Lisa Lopez-Galvan, host of Taste of Tejano lost her life today in the shooting at the KC Chiefs' rally. Our hearts and prayers are with her family. We encourage anyone who feels they saw something to reach out to law enforcement at 816 234 5111."

A person with arms tackled

A man, who was carrying guns, was tackled by the crowd.

"You don't think about it. It's just a reaction," Paul Contreras told CNN's Erin Burnett, who showed video of the moment he tackled the person.

It is still not clear whether the person was among those detained in the incident.

US President Joe Biden reacts

US President Joe Biden described gun violence as an 'epidemic' which is ripping  apart families and communities in the country.

"But all of it is unacceptable. We have to decide who we are as a country. For me, we’re a country where people should have the right to go to school, to go to church, to walk the street — and to attend a Super Bowl celebration — without fear of losing your life to gun violence," Biden said.