The identities of the crew members have not been released. The cause of the crash is under investigation. The missing aviators were onboard a EA-18G Growler that took off from Naval Air Station Whidbey Island during a training flight. It reportedly crashed at around 3:23 p.m. on Tuesday, according to the Navy in a news release.

The Navy is sending crews to investigate the wreckage, which is in a remote area not accessible by motor vehicles.

Search efforts continued Thursday for the two-person crew of a Navy fighter jet that crashed near Washington's Mount Rainier earlier this week, officials said.