Active shooter at largest US military medical center Walter Reed

BREAKING: Police are responding to Walter Reed National Military Medical Center in Bethesda, Maryland amid reports of an active shooter Tuesday afternoon.

U.S. Rep. Dutch Ruppersberger, D-District 2, tweeted from the medical center: “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.”

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Police sappers were called to investigate a suspicious package at the building.

According to a text alert circulated among staff, they were to “lock all doors, turn off all lights” and stay in a secure location until otherwise notified.

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UPDATE: Reports of an active shooter at Walter Reed military hospital in Bethesda, Maryland on Tuesday were confirmed to be a drill, officials said.