Police said the male driver of the car was detained at the scene after the incident which happened just after 7:30 a.m.
“We can’t comment on anything else at the moment,” a London Metropolitan Police spokesperson told CNN.
The nearby Westminster underground station has been closed, according to Transport for London.
Eyewitness Ewelina U. Ochab told CNN: “I was walking on the other side of the pavement from where the incident occurred. I heard some noise, and someone screamed. I turned around and I saw a silver car driving from the crossing — very fast and close to the railings, maybe even on the pavement.”
“The car drove at speed… There was a loud bang from the collusion and a bit if smoke. The driver did not get out. The guards started creaming to people to move away. One elderly man rushed me to hide behind a monument, just in case.”
Developing story, more details to come.