Three Idaho Army National Guard pilots have been killed after the Black Hawk helicopter they were traveling in crashed Tuesday night, officials announced Wednesday.
The incident happened during a routine training flight near Boise. The names of the deceased are being withheld pending notification of next of kin.
"This is a tremendous loss to the Idaho National Guard and our community," Maj. Gen. Michael Garshak, its commander, said in a statement. "Our thoughts and prayers are with the families and loved ones as we work through this tragedy."
Military officials last made contact with the helicopter around 7:45 p.m. Tuesday. An Emergency Transmitter Locator device onboard was activated around 8 p.m.
Snowy weather conditions then hampered initial search efforts, an Idaho National Guard spokesperson told ABC News.
Crews eventually found the wreckage and personnel early this morning, south of Lucky Peak.
"The cause of the accident is unknown and an investigation will begin promptly," officials said in the statement.
This is the second deadly crash of a Black Hawk helicopter from the National Guard in the past two weeks.
On January 20th, a Black Hawk from the New York National Guard -- which was also on a training mission -- crashed outside Rochester, killing three veteran pilots.
Fox News' Lucas Tomlinson contributed to this report.