Three soldiers with the Idaho Army National Guard were killed on Tuesday when their UH-60 Black Hawk helicopter crashed near Boise, the Idaho National Guard has announced.

The soldiers were taking part in a training mission at the time of the incident, a message on the Idaho National Guard’s Facebook page says.

An emergency transmitter locator device aboard the helicopter was activated around 8 p.m. on Tuesday and the crashed helicopter and soldiers were found about 12:15 a.m. on Wednesday, the message says.

It is not known what caused the crash, according to the Army National Guard. Investigators will look into the incident.

The names of three soldiers killed are being withheld pending next of kin notification.

“This is a tremendous loss to the Idaho National Guard and our community,” Maj. Gen. Michael Garshak, commander of the Idaho National Guard, said in a statement. “Our thoughts and prayers are with the families and loved ones as we work through this tragedy.”

This is the second deadly military helicopter crash in the United States within the last several weeks.

Three New York Army National Guard soldiers were killed on Jan. 21 when their UH-60 Black Hawk helicopter crashed in Mendon, New York: Chief Warrant Officer 5 Steven Skoda, Chief Warrant Officer 4 Christian Koch, and Chief Warrant Officer 2 Daniel Prial.

Featured image: A UH-60 Black Hawk leaves a landing pad. (Idaho Army National Guard/Thomas Alvarez)