Members of the emergency services take an injured person away on a stretcher after an incident on Westminster Bridge in London on March 22. Photograph: (Reuters)
Police said there had been an unspecified number of casualties including police officers in the incident
British police said there had been an unspecified number of casualties including police officers in a "terrorist incident" close to Britain's Houses of Parliament on Wednesday.
"We know there are a number of casualties including police officers but at this stage we cannot confirm numbers or the nature of these injuries," Commander BJ Harrington told reporters.
"We received a number of different reports which included a person in the river, a car in collision with pedestrians and a man armed with a knife."
He said the acting head of London police, Craig Mackey, was being treated as a significant witness as he was at scene when the incident took place. He was not one of those injured.