Everett, Wash. ? Two women killed on a hiking trail near Mount Pilchuck died of gunshot wounds, and investigators have ruled out murder-suicide, the Snohomish County sheriff’s office said Friday.

Deputy Rich Niebusch has said the women possibly died in a random attack and urged anyone hiking on nearby trails to be extra cautious.

The victims were identified as Mary Cooper, 56, and her daughter, Susanna Stodden, 27, both of Seattle.

They were last seen alive Tuesday morning. A passer-by found their bodies a few hours later toward the end of a nearly 2-mile trail to Pinnacle Lake, about 50 miles northeast of Seattle, in the Mount Baker-Snoqualmie National Forest, Niebusch said.

Chuck Keller, 74, who manages the nearby Gold Basin campground, said the man and woman who discovered the bodies were visibly shaken.

“He said he saw two ladies on the trail that looked like they were going to the bathroom, then he looked at them and saw they were deceased,” Keller said.

The FBI was aiding the investigation because the killings took place in a national forest.