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Police close the area near Houses of Parliament, London,  after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament.  Britain's MI5 says it is too early to say if the incident is terror-related. (Victoria Jones/PA via AP)
Police close the area near Houses of Parliament, London,  after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament.  Britain's MI5 says it is too early to say if the incident is terror-related. (Victoria Jones/PA via AP)

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Ongoing terror investigation after London attack

CNN's Nic Robertson reports from London.

Ongoing terror investigation after London attack

CNN's Nic Robertson reports from London.