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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A signed has appeared in Barnard Castle poking fun at Dominic Cummings' alleged visit to the town during the lockdown period.
Boris Johnson backed his top aide but there has been criticism from Tory MPs, opposition parties, scientists and even bishops.
The hospital says the action is temporary, and is solely in place to protect staff and patients following a high number of cases recorded.