'No known threat' on Capitol Hill

There is "no known threat" on Capitol Hill at present, according to Senate Sergeant at Arms.

Capitol Hill, which houses both US legislative bodies and a number of other government buildings, is less than a mile from the Washington Navy Yard where the shooting occurred.

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USCP continue to monitor #NavyYardShooting. At this time, no known threat to Capitol Hill, incident stays confined at Navy Yard.

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Capitol Police continue monitoring active shooter at Navy Yard. At this time, incident confined to Navy Yard. No known Capitol Hill threat.

Capitol Police told NBC News that "enhanced security measures" are in place in the area.

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Call for Navy security review

US politicians are calling for a review into how the suspected gunman in Monday's rampage at the Washington Navy Yard received and maintained a security clearance, despite a history of violent episodes.