Mohave County authorities have identified two men killed in a helicopter crash in western Arizona.
The county Medical Examiner's Office says it identified the men killed as 55-year-old David Cormey and 52-year-old Timothy Shawn Brown. The Sheriff's Office says Cormey was from Prescott Valley and Brown from Glendale.
A preliminary report issued Wednesday by the NTSB says the helicopter broke up on impact, leaving a debris field 750 yards long and 150 yards wide.
The preliminary report does not indicate what caused the crash. The agency may later issue a final report that could state the cause.