It was the terrorist attack that police and security services always feared, but hoped would never come. A man, dressed all in black, drove a car at 50mph the full length of Westminster Bridge, aiming deliberately at pedestrians and cyclists.
The bodies were scattered in his wake. One woman died after she was hit and thrown under the wheels of a bus; another woman was struck as she walked past a stand selling postcards to tourists. She lay on the ground under the shadow of Big Ben, blood pouring from the wound in her head and seeping into cracks in the pavement.
The driver of the Hyundai 4×4 then crashed the vehicle into the iron railings that surround the Palace of Westminster, hitting at least two more pedestrians. He leapt from the car and ran around the corner, brandishing a kitchen knife, eight inches long.
Hundreds of tourists and workers, panicked into a “stampede”, ran for their lives while, the attacker, now on foot, headed for Parliament Square and pushed past police officers at the barrier to New Palace Yard. Just within the entrance he slashed and stabbed at an unarmed policeman, who would later die of his wounds.
Source By http://www.telegraph.co.uk