The Federal Capitol and all surrounding buildings were placed under preventive closure following the report of an external threat.

A later report indicates that at least one person was shot in the vicinity of the legislative body, but his condition and who he is is unknown.

In a Twitter post, NBC News correspondent Leigh Ann Caldwell commented on the situation, saying that a helicopter had landed nearby and that emergency management units are on site.

This is news in development, come back for future updates.

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