AP - TONTO NATIONAL FOREST, Ariz. ? The flash flood that killed nine people in an Arizona river canyon began its deadly descent as an impressive but avoidable surge of churning water, black with cinders from a recent wildfire and choked with tumbling tree trunks and limbs.By the time it reached a rocky swimming hole several miles downstream, it was a roaring torrent 6 feet (1.8 meters) high, and an extended family celebrating a birthday while seeking refuge from the summer heat
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