Bystanders tackled suspected Kansas City gunman after shooting that left 1 dead, 21 injured: Witness

KANSAS CITY, Mo. -- Bystanders sprung into action as gunfire rung out at the Kansas City Chiefs' Super Bowl parade on Wednesday, which left one person dead and at least 21 others injured, according to authorities.

Alyssa Marsh-Contreras told ABC News her father, Paul Contreras, tackled a man believed to be a shooting suspect who appeared to be fleeing on foot; Contreras could be seen as one of the bystanders who tackled the man in a video obtained by ABC News.

Kansas City Police Chief Stacey Graves confirmed three people are detained and under investigation, in a press conference after the deadly shooting, which she called a "tragedy."

MORE | Kansas City shooting leaves 1 dead, 21 injured, including kids, after KC Chiefs parade, rally

One person was killed and 21 people were injuerd in a shooting just after the Kansas City Chiefs Super Bowl victory parade and rally ended Wednesday.

In video posted to X, two individuals can be seen tackling the suspect to the floor, pinning them down and repeatedly punching them until two police officers ran up and detained the suspect.

The shooting took place west of Union Station, near the garage, as Chiefs fans were leaving, according to Kansas City police.

Kansas City Mayor Quinton Lucas said there were 600 Kansas City, Missouri Police Department officers and 250 officers from outside agencies present at the scene.

Kansas City fire officials said one person is dead and nine were injured in a shooting after the Chief Super Bowl victory rally Wednesday.

The mayor has spoken to the Kansas City Chiefs who clarified that their prayers are with everyone at the parade today and that their players, coaches and staff are all accounted for and safe.

About 1 million paradegoers were expected at Wednesday's celebration.

Paradegoer Arnold Sauther told KMBC that when the rally ended, the Chiefs players went into Union Station, and fans followed to get autographs.

"I am angry," Graves said. "The people who came to this celebration should expect a safe environment."

The mayor of Kansas City and Police Chief Stacey Graves gave an update on the shooting after the KC Chiefs parade and rally celebrating their Super Bowl win.

Missouri Governor Mike Parson released a statement following the deadly shooting, saying, "I want to start with a thank you to Kansas City Police along with other state and local first responders who were able to quickly take two individuals into custody and provide critical care to victims following today's shooting."

"This was a tragic conclusion to a celebration we had all looked forward to," he wrote.

The mayor, who was at the parade with his wife and mother, was among the many who ran for safety.