The governors of Kansas and Missouri were both at the rally but were not hurt.
Quinton Lucas, the mayor of Kansas City, Mo., said he was at the parade with his wife and mother, and was in Union Station when he heard gunfire.
“When you have people who decide to bring guns to events, when you have people who are deciding to try to mar events — celebratory ones, like this one — all of us start to become members of this club that none of us want to be a part of,” Mr. Lucas said.
Patrick Mahomes, the Kansas City Chiefs’ quarterback who led his team to victory over the San Francisco 49ers on Sunday, said he was “praying for Kansas City.” Travis Kelce, the star tight end, wrote that he was “heartbroken,” adding, “KC, you mean the world to me.”
The shooting was a reminder for some, young and old, about the plague of gun violence in America..
Dana Brady and her 14-year-old daughter, Madison, froze at first when they heard the popping of gunfire, then saw a blur of people ran toward them, Ms. Brady said. They found cover in Union Station, sitting down beside a woman and her young children, who were crying.
“We talked about this in school,” Ms. Brady recalled one of the children saying. “To turn off our phones and be very quiet.”
Reporting was contributed by Traci Angel, Julie Bosman, Robert Gebeloff, Gaya Gupta, Jesus Jiménez and Ben Shpigel. Susan C. Beachy and Sheelagh McNeill contributed research.
