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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.

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'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.

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

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