Shooting at Kansas City Chiefs' Super Bowl celebration: Bystanders who helped tackle suspect speak out

Bystanders sprung into action when gunfire rang out near the end of the Kansas City Chiefs' Super Bowl celebration on Wednesday.

Trey and Casey Filter attended the packed parade and rally with their children in Kansas City, Missouri. As they and scores of other Chiefs fans were getting ready to leave, Trey Filter said a "commotion" broke out and he could see someone "being chased" as people shouted, "Get him!"

"I jumped and remember thinking, 'I hope this is the dude they were talking about,'" he recalled in an interview Thursday with ABC News on "Good Morning America."

"We were pretty elated once we knew we had him and they started yelling that 'there's a gun, there's a gun.' So we were pretty steadfast in holding him down there," he added. "We just made it very clear that he wasn't allowed to move. He didn't have much to say."

Casey Filter said her "first thought" when she saw a gun on the ground was to "get it away from what was happening."

"I was just wanting everyone to be safe -- that was my main concern," she told ABC News.

A video posted to social media shows two individuals tackling someone to the ground, pinning them down and repeatedly punching them until two police officers run up and detain them. Alyssa Marsh-Contreras told ABC News that her father, Paul Contreras, was among the bystanders who took down one of the alleged gunman who appeared to be fleeing on foot.

The Filters said the reality of what had happened didn't start to set in until the three-hour drive back home to Wichita, Kansas,

"It's a pretty sobering situation," Trey Filter told ABC News. "It's been pretty fast-paced for us and I'm sure for the kids as well."

"They are pretty proud of their dad though," Casey Filter said. "That is a fact."

The gunfire killed one person and wounded at least 21 others, according to the Kansas City, Missouri, Police Department.

Three suspects were detained and at least one firearm was recovered from the scene, police said. An investigation into the shooting was ongoing, with the motive unclear.

ABC News' Victoria Arancio, Youri Benadjaoud, Alexandra Faul and Joshua Hoyos contributed to this report.