Sensitive official diagrams of New York's third-largest subway station have been found discarded at a busy Brooklyn intersection.

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Experts say the secret Metropolitan Transit Authority documents of the Atlantic Avenue station, discovered by the New York Post last week, could give terrorists all the information they would need to plan an attack.

"To somebody hell-bent on doing something wrong, that kind of information is invaluable," former MTA Inspector General and FBI and New York police veteran John Pritchard told the Post. "It's just inconceivable to me that something like that would be floating around the streets."

The documents show the location of air ducts and specific manholes where one could gain access; diagrams of wiring and other components of the station's electrical system; the size of structural beams holding up the station; and the location of rooms and passageways unknown to the general public.

"Good grief," said Transportation Workers Union official Pete Foley. "This is literally a blueprint for terrorists."