FOUR people were killed, including an unarmed police officer, and around 40 others were injured, after a knifeman brought terror to the heart of Westminster during a suspected terror attack.

The attacker, armed with two large knives, mowed down pedestrians with his car on Westminster Bridge, including schoolchildren, then rushed at the gates in front of the Houses of Parliament, stabbing the policeman before being shot dead by other officers.

The fatally wounded policeman, who was unarmed, was named by Scotland Yard’s top anti-terror officer Mark Rowley as 48-year-old husband and father Keith Palmer.

It came as the Prime Minister vowed to defeat what she called “the forces of evil”.

Mrs May, who was in Parliament at the time of the attack, praised the bravery of police officers who killed the attacker as he sought another victim.

Armed officers, some in plain clothes and wearing balaclavas, swarmed around the yard just feet from where MPs had earlier attended Prime Minister’s Questions.

The knifeman drove a grey Hyundai i40 across Westminster Bridge before crashing it into railings, then running through the gates of the Palace of Westminster.

His attack left a trail of destruction as paramedics tended to victims on the bridge and at the gate.

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Mr Rowley said police believed they knew who the suspect was, but would not go into further details.