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TMZ Sports has obtained the 911 calls made in connection to the fatal plane crash that took the lives of Greg Biffle and his family ... with witnesses documenting the horrific scene in North Carolina last month.
Officials released five calls on Tuesday ... and among the files are several individuals on the line who sounded frantic as they asked for help at the location.
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One caller said he was golfing on the nearby course when he saw the Cessna C550 plane carrying Biffle and his family fly over a tree line and out of sight.