Unknown force fires bullets into unmanned part of Pentagon

Stranger than fiction. Was this some kind of warning?
Police Investigating Report of Shooting at the Pentagon
(Oct. 19) -- Gunshots struck the Pentagon before dawn today, and authorities briefly shut down the massive complex and a nearby interstate as they searched for a possible source.

An officer with the Pentagon Force Protection Agency heard what he believed were gunshots coming from the south parking area of the Pentagon just before 5 a.m., according to Agence France-Presse. The Pentagon's entrances were shut down, as well as part of I-395, for about 45 minutes while Pentagon and local law enforcement officers searched the area, according to reports.

At a briefing hours later, Steve Calvery, the head of the Pentagon's police force, said fragments from two bullets were still lodged in two windows, which had been shattered but not penetrated, radio station WTOP in Washington reported. The windows were on adjacent floors of the building in an area that was under renovation and unoccupied.