Protesters interrupted a US Senate hearing where Deputy National Security Adviser John Brennan testified on his nomination to be the director of the CIA.
The protesters were escorted out, after Senator Dianne Feinstein asked for the room to be cleared. The activists were believed to be demonstrating against US drone strikes in Yemen and Pakistan.
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Emergency services were alerted to the crash at 3.50pm on Thursday, Sussex Police said.
WARNING: Some people may find some of the images in this report distressing.
Medical staff who helped during the Westminster terror attack have received a royal thanks for their life-saving efforts.