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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Both the pilot and the passenger died in the collision shortly before 5pm near Shaw Lane, Shifnal near Telford.
Councils have been warned not to use instruction leaflets after accusations that they appear to promote the 'In' campaign.
The rumour led to praise from many fans - while some said they would be boycotting the film.