Two elk hunters found dead in southern Colorado after a massive search were the victims of a lightning strike, authorities confirmed Monday.

Conejos County Coroner Richard Martin, speaking to The Colorado Sun, confirmed Andrew Porter and Ian Stasko were killed by lightning while hunting southwest of Monte Vista.

The hunters were found below a tree and had slight burns on their bodies, Martin said.

“A slight burn is like if you take a match and stick it on your arm,” he said. “And there were only two or three of them,” he said.

He said the hunters’ deaths were likely instantaneous, but he could not confirm the exact time of death.

“That kind of death is just instant. It’s like you’re alive and now you’re not,” Martin said. “Just that quick. Split second.”

Conejos County Sheriff Garth Crowther said Porter and Stasko were clothed and with one small daypack between them when searchers found them Sept. 18. They had not set up a camp, and were dressed in camouflage clothing Crowther described as “not the warmest.” Their bodies were located close together and six days after the men were last seen at the Rio de Los Pinos trailhead.

One of the men had a bow with him, Crowther said. Neither had a gun. They did not activate an emergency GPS beacon.

Martin performed the autopsy Monday morning.

Investigators did not find any obvious signs of foul play or injuries on their bodies.

Search and rescue teams found the hunters’ bodies two miles above the Rio de Los Pinos trail in the South San Juan Wilderness, ending a nearly weeklong search.

Last week, Martin said first responders saw no signs of a lightning strike. Inside the hunters’ car, which was parked at the trailhead at around 10,000 feet, authorities found wet clothes. None of the gear Porter would need to hunt, harvest or pack out elk was in the car.