Police in Maryland say they're investigating a possible report of an active shooter at the Walter Reed hospital outside Washington.
Montgomery County Police officer Rick Goodale says police were called to the scene on Tuesday just after 14:20.
In a tweet, US Rep. Dutch Ruppersberger of Maryland says he and about 40 other people are in a conference room at the hospital.
No other details were immediately available.
Goodale says, "We have officers out there, but as of yet we haven't been able to confirm this report".
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