"As I turned left out of Whitehall, so turning left to go over the bridge, I saw a car knock two people over," he said.
"Initially I thought he's lost control of the car, but then I saw quite a few people rushing into parliament and police trying to stop everyone.
"After a few seconds I just heard gunshots. Everybody on my bus was panicking."
He added: "I did not see him coming over the bridge but I saw everybody laying on the bridge, not moving."
One witness, Ismael, was waiting at a traffic light near Westminster Bridge.
He said: "As I was waiting for the light to change, the car sped up and passed me.
"That small shop after the traffic light... that's the first victim hit... second after a few metres and the third and by then it clicked that something was going on.
"It (the car) continued... by the end of the bridge - I don't know what's happening but there was a lot of people on the pavement and the car went straight."
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