Two crew members who were missing following the crash of a fighter jet in mountainous terrain in Washington state during a routine training flight have been declared dead, the U.S. Navy said Sunday.

The EA-18G Growler jet from the Electronic Attack Squadron crashed east of Mount Rainier on Tuesday afternoon, according to Naval Air Station Whidbey Island. Search teams, including a U.S. Navy MH-60S helicopter, launched from the air station to try to find the crew and crash site.

Army Special Forces soldiers trained in mountaineering, high-angle rescue and technical communications were brought in to reach the wreckage, which was located Wednesday by an aerial crew resting at about 6,000 feet (1,828 meters) in a remote, steep and heavily wooded area east of Mount Rainier, officials said.

The aviators’ names won’t be released until a day after their next of kin have been notified, the Navy said in a statement Sunday, adding that search and rescue efforts have shifted into a long-term salvage and recovery operation as the cause of the crash is still being investigated.

“It is with a heavy heart that we share the loss of two beloved Zappers,” said Cmdr. Timothy Warburton, commanding officer of the aviators’ Electronic Attack Squadron. “Our priority right now is taking care of the families of our fallen aviators. ... We are grateful for the ongoing teamwork to safely recover the deceased.”

Locating the missing crew members “as quickly and as safely as possible” had been top priority, Capt. David Ganci, commander, Electronic Attack Wing, U.S. Pacific Fleet, said Thursday.

The EA-18G Growler is similar to the F/A-18F Super Hornet and includes sophisticated electronic warfare devices. Most of the Growler squadrons are based at Whidbey Island. One squadron is based at Marine Corps Air Station Iwakuni, Japan.

The “Zappers” were recently deployed on the USS Dwight D. Eisenhower.

The search took place near Mount Rainier, a towering active volcano that is blanketed in snowfields and glaciers year-round.

The first production of the Growler was delivered to Whidbey Island in 2008. In the past 15 years, the Growler has operated around the globe supporting major actions, the Navy said. The plane seats a pilot in front and an electronics operator behind them.

“The EA-18G Growler aircraft we fly represents the most advanced technology in airborne Electronic Attack and stands as the Navy’s first line of defense in hostile environments,” the Navy said on its website. Each aircraft costs about $67 million.

Military aircraft training exercises can be dangerous and sometimes result in crashes, injuries and deaths.

In May, an F-35 fighter jet on its way from Texas to Edwards Air Force Base near Los Angeles crashed after the pilot stopped to refuel in New Mexico. The pilot was the only person on board in that case and was taken to a hospital with serious injuries.

Last year, eight U.S. Air Force special Operations Command service members were killed when a CV-22B Osprey aircraft they were flying in crashed off the coast of Japan.

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This story has been updated to correct the Navy says it has declared the crew members dead, not found them dead.

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Associated Press writer Jesse Bedayn contributed to this report from Denver.