A military helicopter crashed in Azerbaijan during a training flight, killing 14 people and wounding 2 more, Azerbaijani authorities said, writes ABCNEWS.

The helicopter of Azerbaijan’s State Border Guard service crashed on Tuesday morning during a flight over the Garaeybat training ground in the east of Azerbaijan, according to a joint statement of the border guard service and Azerbaijan’s Prosecutor General’s office.

It wasn’t immediately clear what caused the crash, which the two state agencies are investigating.

Azerbaijan’s President Ilham Aliyev and his wife Mekhriban Aliyeva have extended their condolences to the families of the victims.