Two crew members were killed when a medical helicopter crashed in “rugged terrain” east of Phoenix, Arizona, late Tuesday, NBC News reported.
A third crew member survived the crash. No patients were on board.
The chopper went down in “unknown circumstances” just after 8 p.m. local time (11 p.m. ET), a Federal Aviation Administration spokesman said.
It was returning to Globe, Arizona, when it crashed in the Superstition Mountains, according to NBC station KPNX.
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The cause of the crash is under investigation.