Arkansas authorities say a 28-year-old schoolteacher has admitted he killed a couple who were hiking with their two young daughters at a state park, and he has been charged with capital murder in what investigators are portraying as a “random” attack.

Clinton, 43, and Cristen Brink, 41, were found dead on Saturday on a walking trail at Devil’s Den state park. Their daughters, seven and nine, were not hurt and are being cared for by family members, authorities have said.

State police arrested Andrew McGann on Thursday after a five-day search and a flood of tips. He was captured in Springdale, a city about 30 miles (50km) north of Devil’s Den.

McGann