India, July 28 -- Arkansas officials have launched a search to identify the killer of two parents who were murdered while hiking with their two daughters in Devil's Den State Park.

Cristen Amanda Brink and her husband Clinton David Brink were attacked when the family was enjoying a trek on a walking track in the isolated park in Washington County. However, their 7 and 9-year-old daughters remained unharmed and they are being looked after by their relatives.

For now, investigators have not yet disclosed how their parents were slain, and it is still unknown what the girls saw at the scene.

However, the detectives have made public a number of details about the suspect and urged other hikers who were in the park that day to review their pi...