 NPR's Claudia Grisales reports several officials have been asked to testify on Capitol Hill. Officials in Butler County, Pennsylvania, who have been defending their officers, have been called to appear before the House Homeland Security Committee. One of those officials, Butler County Sheriff Michael Sloop, told NPR his deputies went above and beyond before and after the shooting. Sloop said it was an officer from Butler Township who confronted the shooter on the roof.