The shooter has been reported as "neutralized." No one is currently being admitted into or allowed to leave the U.S. Capitol Building or the Visitors' Center.
A suspicious package has also been found and may be related to the incident. Police are investigating.
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Source: http://www.usatoday.com/story/news/nation/2015/04/11/washington-dc-capitol-building-lockdown/25633433/
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Graphics: Mine
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Keywords: shooter, Capitol, Visitors Center, package, lockdown