Police have arrested two white supremacist gang members following an attack on corrections officers at an Idaho hospital, and investigators are looking into whether they killed two people while on the run. Escaped prison inmate Skylar Meade and accomplice Nicholas Umphenour were arrested during a traffic stop Thursday afternoon in Twin Falls. Police say Umphenour shot two Idaho corrections officers early Wednesday to break Meade out of custody. Authorities said during a news conference Thursday that they were investigating two homicides, in Clearwater County and Nez Perce County, which borders Washington state. Police found shackles at the scene of one of the killings.