Despite reports of gunfire, a federal law enforcement official said there were no shots fired at the Washington Navy Yard Thursday morning.
The official, who has been briefed on the situation, spoke on the condition of anonymity to disclose details of the ongoing investigation.
Authorities conducting a search of the Navy Yard campus in Washington Thursday in response to reports of an active shooter.
Federal law enforcement sources said no active shooter was found.
In September 2013, military contractor Aaron Alexis killed 12 civilian workers at Building 197 before he was fatally shot by police.
CBS affiliate WUSA-TV reported officers from the U.S. Park Police and the district's Metropolitan Police Department responded. Buildings at the facility were instructed to be locked down, and people were told to shelter in place.
A heavy police and fire department presence started blocks away from the Navy Yard, with roads blocked off and a helicopter hovering overhead.
The Navy Yard, in southeast Washington, is the country's oldest naval installation
The Associated Press contributed to this report.