The 3rd Marine Logistics Group is based at Camp Kinser, Okinawa. (U.S. Marine Corps)

One of two U.S. Marines who went missing Friday during a mountain hike in northern Japan has died.

The pair went missing on Mount Furano in Hokkaido, Japan’s northernmost main island, said 3rd Marine Logistics Group spokesman Capt. Brett Vannier.

Both were found by Saturday and one was declared dead that day, Vannier told Stars and Stripes by phone Monday.

“We are all incredibly saddened by this loss,” group commander Brig. Gen. Kevin Collins said in a statement emailed by Vannier. “We are united in grief with their family, friends, and fellow Marines, and we will do everything we can to support them during this difficult time.”

The Marines’ identities have not been released, pending next-of-kin notification, Vannier said.

Hokkaido Broadcasting reported that the Marines became separated in fog. One of them called police around 4 p.m. Friday and was found uninjured about six hours later on a mountain road at an elevation of approximately 4,300 feet, according to the report.

He is undergoing medical evaluation, Vannier said.

The other Marine was found Saturday morning lying on a trail at around 4,600 feet, Hokkaido Cultural Broadcasting reported Saturday, citing police. He was taken to a hospital by helicopter but later died.

Police said both Marines were prepared for winter mountain hiking but encountered poor visibility due to fog.

“We extend our deepest gratitude to the Japanese authorities, local rescue teams, and all those involved in the search and recovery efforts,” Vannier said in the email.