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Emergency services transport an injured person to an ambulance, close to the Houses of Parliament.
Police secure the area close to Parliament after Wednesday's attack.
Emergency workers provide medical attention near the Houses of Parliament in London on Wednesday.
An air ambulance lands near the Houses of Parliament in London on Wednesday.
Armed police officers gather outside Parliament on Wednesday.
An injured person is moved to an ambulance, close to the Houses of Parliament after Wednesday's attack.
Emergency services at the scene outside the Palace of Westminster, London on Wednesday.
Police secure the area around the Houses of Parliament in London on Wednesday.