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SHANKSVILLE, Pennsylvania (CNN) -- Investigators probing the crash of the hijacked United Airlines plane that went down in western Pennsylvania announced Thursday they found another field of debris six miles away from the main crash site.

Officials said an engine part has been recovered. Much of the debris is very small in size; most of the largest pieces are about the size of a pad of paper.

Information from a telephone call made by a passenger indicated that passengers on Flight 93 tried to wrest control from the hijackers, and may have caused the plane to crash before it reached whatever target the hijackers were aiming for. All 45 people aboard were killed.