sentences:  In 2008, the BBC published an article that was based on its examination of partly declassified documents obtained some years earlier, via the United States Freedom of Information Act.The documents appeared to confirm that within weeks of the accident, investigators realized only three of the weapons could be accounted for.One of the declassified documents—dated to January 1968—details a blackened section of ice which had refrozen with shroud lines from a weapon parachute