(Reuters) -Three people were in custody in Kansas City, Missouri, on Thursday, facing questions about what led to a deadly mass shooting near the city's Super Bowl victory rally and who was behind it. At least one person was killed and 21 others wounded by gunfire on Wednesday outside the city's landmark Union Station, where thousands of fans had gathered with the Kansas City Chiefs to celebrate the team's NFL championship triumph over the San Francisco 49ers, authorities said. Local radio station KKFI identified the slain victim as Lisa Lopez, one of its disc jockeys and host of the show "Taste of Tejano."