London police say a number of casualties in parliament 'terrorist' 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."

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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.

(Reuters)