Investigators are searching for answers after gunfire erupted at the end of the Chiefs' Super Bowl celebration in Kansas City, Missouri, on Wednesday, killing one person and injuring at least 21 others. More than 800 law enforcement officers were on duty in the area, as 1 million paradegoers were expected to attend Wednesday's celebration, according to Kansas City Mayor Quinton Lucas. Three suspects were detained and at least one firearm was recovered from the scene, according to Kansas City police.