(Newser) – A small plane crashed into Arizona's Superstition Mountains Wednesday night and authorities believe all six people aboard, three adults and three children, were killed, the AP reports. Rescue crews flown in by helicopter had to hike their way to the crash site, which lies in rugged terrain around 40 miles east of Phoenix. The body of one child has been recovered and there is no sign of survivors, authorities say.

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"The fuselage is stuck down into some of the crevices of this rough terrain, and we're doing our best at this point in the darkness," the county sheriff says. "This is not a flat area, this is jagged peaks, almost like a cliff-type rugged terrain. Witnesses say that before the crash, they heard a plane apparently trying to rev its engines to climb higher. "Somebody didn't know the mountain was there or they had false readings," one witness tells CNN. (Read more plane crash stories.)

