BETHESDA, Maryland (KWTX) Officials sounded the all clear Tuesday, saying they found "no indication" of an active shooter after clearing the basement of a building at Walter Reed National Military Medical Center in Bethesda, Md., outside Washington.
Naval Support Activity Bethesda tweeted Tuesday afternoon that an active shooter had been reported in the basement of a building at the Maryland base.
About 40 minutes later, NSAB tweeted that base security had cleared the basement was in the process of clearing the rest of the building.
Security had found "no indication so far of an active shooter."
The NSAB gave the all clear about an hour after the report of an active shooter in the basement of a building.
NSAB oversees operational support for its major tenants at the base, including Walter Reed.
Officials say the reports of an active shooter were a "genuine false alarm" and not a drill.
NASB spokesman Jeremy Brooks says there was no drill at the Maryland base Tuesday and they were still trying to determine the origin of the report.
The U.S. Navy had tweeted earlier that an "ad hoc drill" was being conducted at the base.
U.S Rep. Charles Albert Dutch Ruppersberger III, D-Maryland, sent a tweet earlier in which he said “I am currently at Walter Reed Medical in Bethesda where we've been told there is an active shooter. I am currently safe in a conference room w/ approx 40 others.”