US Capitol Police say they have re-opened the Hart Senate building, following an evacuation.
Tests on a suspicious package were negative, Reuters reports.
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New Army unit which will use psychology and social media to help Britain "fight in the information age" is being set up, the MoD announced.
Police proposals suggest that all frontline police officers should have the option of arming themselves with Tasers.
Snow showers and sleet expected to affect parts of Scotland and Northern Ireland, with snow extending further south.