Published: Oct 19, 2010 3:46 PM EDT
Updated: Oct 19, 2010 12:47 PM EDT

WASHINGTON (AP) - Pentagon entrances were locked down early Tuesday after a report of possible shots fired near the building.

Major Chris Perrine, a Pentagon spokesman, says a civilian reported he may have heard shots at about 5 a.m. EDT on the south side of the massive Defense Department headquarters.

Perrine says police authorities did a sweep of the area and didn't find anything.

The roads and pedestrian entrances leading to the Pentagon were reopened a little after 5:30.