Kansas City shooting: Police investigating what motivated shooter at a Chiefs Super Bowl celebration

​ Police are working to determine who opened fire and what motivated a shooting that killed one and wounded more than 20 others at the end of the Kansas City Chiefs’ Super Bowl victory rally, sending fans clad in red jerseys running, taking cover or tending to others on the ground as law enforcement swarmed the area, confetti still blowing in the wind. Read More Breaking News, Latest News and Videos | CNN