The Department of Defense said Tuesday afternoon that there was no active shooter in Walter Reed and that the reports of a shooter in the center were part of an exercise.
Pentagon spokeswoman Lt. Col. Audricia Harris told CNN just after 3:15 p.m. ET Tuesday that the situation in Walter Reed was an exercise.
The United States Navy said on Twitter that it had confirmed that there was no active shooter.
"It was an ad hoc exercise performed by the tenant's command," the Navy wrote on Twitter.
However, the local military agency involved, the Naval Support Activity Bethesda, contradicted that statement on Tuesday afternoon.
"Around 2 o'clock today afternoon, Tuesday, November 27, a call came to safety at the NSA Bethesda with the report of an active shooter situation in the basement of Building 19 at Walter Reed Bethesda," said a publication. Facebook of the agency. "The Security Department responded and cleared the building, without finding evidence of an active shooter." After investigating the call and the origin, the NSA Bethesda determined that it was a false alarm and not part of a scheduled drill, as reported. "
The confusion began when the press office of the Montgomery County Police Department said it had received a call to assist in a report by an active shooter on Walter Reed.
The Dutch representative Ruppersberger, D-Maryland, tweeted about the situation from inside the center.
"I am currently at Walter Reed Medical in Bethesda, where we have been told there is an active shooter," Ruppersberger wrote on Twitter. "I am currently safe in a conference room with approximately 40 more people."
Later on Tuesday, Ruppersberger said he was still confused about whether the incident had been a sham.
Two individuals told CNN separately that they were inside the building at Walter Reed just before 3 p.m. Tuesday and they were told to continue taking refuge in the place. One individual said that the speakers announced that it was still an active situation. The other individual reported hearing many sirens.
Shortly after 2 p.m., the account noted that "there is a report from an active shooter" in the basement of a building in Walter Reed. As the hour progressed, the account said that the security of the base had cleaned the basement and that "until now there were no signs of an active shooter."
At 3:20 p.m. ET, the Facebook page was updated to say "everything was clear" and "no active shooter was found."