Police on Thursday arrested two white supremacist gang members — an Idaho prison inmate and the accomplice who helped him escape — following an attack on corrections officers at a Boise hospital, and investigators are looking into whether they killed two people while on the run.

Skylar Meade, the escaped inmate, and Nicholas Umphenour, the man who police say shot two Idaho corrections officers early Wednesday to break Meade out of custody, were arrested after a brief car chase Thursday afternoon in Twin Falls, about 130 miles (209 kilometers) from where they escaped.

Authorities said during a news conference Thursday that they were investigating two homicides, in Clearwater County and Nez Perce County, which borders Washington state. Both victims were men. Police found shackles at the scene of one of the killings and “that’s one of the ways we tied them together,” Idaho State Police Lt. Colonel Sheldon Kelley said.