A mechanical failure, specifically a problem with the main rotor, caused the fatal DPS helicopter crash in Flagstaff, according to a preliminary NTSB report.

Investigators released their preliminary report on the DPS helicopter that crashed in Flagstaff last month, killing both officers onboard. The report found no evidence of maintenance issues or ...

The preliminary NTSB report reveals more details about the deadly helicopter crash reported last month in Flagstaff.

Douglass Byers was convicted of firing a rifle shot that pierced the tail of an LAPD helicopter in South L.A. last year. Prosecutors say the round could have caused a catastrophic helicopter crash.

Add Yahoo as a preferred source to see more of our stories on Google. Two helicopters that crashed in Hammonton on Dec. 28, killing both pilots, were flying in formation just before colliding, a ...