Other British media have reported that the car, which is allegedly around one year old, could have been rented out of Birmingham.
The Guardian said on Thursday morning that a police raid was carried out in Birmingham in the early hours of Thursday, although it was not clear whether it was related to the Wednesday terror act in London.
On Wednesday, an attacker, whose identity is yet to be revealed by police, hit several people while driving on Westminster Bridge. He then tried to enter the parliament building armed with a knife. After stabbing a police officer, who was later confirmed dead at the scene, the attacker was shot.
According to Metropolitan Police Acting Deputy Commissioner Mark Rowley, the Wednesday terror act resulted in the death of five people, including the attacker, who could have been inspired by international terrorism. At least 40 people were injured, including three police officers, two of whom are in serious condition.
According to several British media reports, witnesses have identified the attacker as an "Asian man" around 40 years of age.