Pentagon entrances were briefly locked down early Tuesday morning in response to a report that gunshots were fired near the building.
Pentagon spokesman Maj. Chris Perrine said a civilian reported possible gunfire by the building's south side about 5 a.m. "Security didn't hear anything, but someone told them there could have been shots fired," he said. Authorities did a sweep of the area but found nothing suspicious. Roads and entrances were reopened a half-hour later.
Security has increased at the Pentagon since the shooting in March, when 36-year-old John Patrick Bedell opened fire at a security checkpoint, injuring two police officers. Three officers returned fire, killing the shooter.
The Associated Press contributed to this report.
Want to contribute to this story? Share your addition in comments.