(Los Angeles) Two US Army attack helicopters crashed Thursday during a training flight in Alaska (northwestern United States), said the US military without specifying the number of victims in this accident, which is the second of its kind in less than a month.

The two AH-64 Apache helicopters “crashed today near Healy, Alaska while returning from a training flight,” the U.S. Army’s 11th Airborne Division said in a statement.

“Rescuers are on site. The incident is under investigation and more information will be released once available,” she said, without giving the number of casualties.

In late March, nine soldiers died when two US Army Black Hawk helicopters crashed during a nighttime flying exercise in Kentucky.

A Black Hawk helicopter also crashed in mid-February in Alabama, in the southern United States, killing the two occupants on board.

The aircraft, belonging to the Tennessee Air National Guard, was also performing a training flight, near a highway and another highway. The reasons for the crash had not been communicated at the time.