A policeman has been stabbed and his attacker shot by officers after a major terrorist incident at the Houses of Parliament. 

The attacker mowed down several pedestrians as he drove a grey Hyundai i40 across Westminster Bridge before crashing it into railings then running through the gates of the Palace of Westminster and stabbing the officer. 

Eyewitnesses said he was shot by police as he approached a second officer, while clutching his knife. 

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