Kansas City police are investigating three shootings Tuesday that happened within 20 minutes, injuring four people.The shootings happened roughly between a little after 6 p.m. and 6:20 p.m.​The shootings happened at:33rd Street and Norton Avenue -- Police say one person suffered a non-life-threatening​ injury.5200 block of East 28th Street -- Authorities found a person with a non-life-threatening injury. Investigators said the victim told police he was shot elsewhere and showed up at the East 28th address looking for help.Blue Ridge Cutoff and East 63rd Street -- Police said two people were shot. Their injuries were believed to be non-life-threatening. Investigators said the victims showed up at the QuikTrip after their car was shot at on Interstate 435 near 63rd Street.​