The AH-1Z Viper attack helicopter. (Bell Flight)
Two U.S. Marine Corps pilots were killed as a result of a Bell AH-1Z Viper helicopter crash in the vicinity of Yuma, Arizona, at around 8:45 p.m. on March 30, according to the Marine Corps.
The Marines were conducting a routine training mission in the two-seater attack helicopter as part of the Weapons and Tactics Instructor course.
The cause of the crash is currently under investigation.
The names of the deceased will be withheld until 24 hours after next-of-kin notification.
This is a developing story and will be updated as more information becomes available.