Investigators say they've found no indication of arson or other foul play in the fire that damaged buildings at the Flight 93 National Memorial in Shanksville, Pennsylvania.
A National Park Service spokesman said Sunday the investigation isn't over, and it may be weeks before officials determine the cause of the blaze that destroyed its headquarters.
The scene is now under control of park officials, who are doing what they can to salvage material left after the Friday fire.
An initial inventory indicated the losses included a flag that flew over the U.S. Capitol on Sept. 11, 2001, the day four planes were hijacked.
Flight 93's passengers fought with the attackers before it crashed in western Pennsylvania.
The memorial and visitor center, under construction about 2 miles away, weren't damaged.
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