Three soldiers were killed and one has been injured after two Army helicopters crashed during training over Alaska on Thursday, officials said.

Joint Base Elmendorf-Richardson said two AH-64 Apache helicopters returning from a training mission collided and crashed near Healy.

The helicopters were from the 1st Attack Reconnaissance Battalion's 25th Aviation Regiment at Fort Wainwright in Fairbanks, officials said.

The incident is being investigated. Healy is about 110 miles southwest of Fairbanks by vehicle.

In March, nine service members died after two Army Black Hawk helicopters crashed during a training mission in Trigg County, Kentucky, an Army official said.

This is a developing story. Please check back for updates.

ABC News' Peter Charalambous, Victoria Arancio, Kevin Shalvey and Jaclyn Lee contributed to this report.