A motorist slammed into pedestrians and cyclists near Britain�s Houses of Parliament on Tuesday and police are treating the incident as an act of terror.

A man in his 20s was arrested on suspicion of terrorist offenses after the silver Ford Fiesta collided with rush-hour commuters before slamming into a barrier. Two people were hurt, but authorities said none of the injuries is life-threatening.

Armed police swooped into the area, arresting the driver and cordoning off streets surrounding the heart of Britain�s government. Police appealed to the public to stay away, and the Westminster Tube station was closed.

Images from Sky News and social media showed a man in a puffy black jacket who was surrounded by police and led away in handcuffs from a silver car.

BREAKING: There has been an incident outside of Westminster. Police are urgently clearing the area. More updates to follow. pic.twitter.com/mnKUVI7Npn

— Good Morning Britain (@GMB) August 14, 2018

#BREAKING VIDEO: Large police presence after car crashes into security barrier outside Parliament pic.twitter.com/wvsf0DgqLt

— Al Boe ? BREAKING NEWS ? (@AlBoeNEWS) August 14, 2018

Metropolitan Police says it is treating the crash outside Parliament as "a terrorist incident"

— Sky News Breaking (@SkyNewsBreak) August 14, 2018

Eyewitnesses described the car as being driven at high speed before hitting carriers. Several suggested it was deliberate.

�The car drove at speed into the barriers outside the House of Lords. There was a loud bang from the collision and a bit of smoke,� Ewelina Ochab told The Associated Press. �The driver did not get out. The guards started screaming to people to move away.�

Jason Williams, 45, from Kennington, also saw a car moving at high speed.

�It looked deliberate. It didn�t look like an accident,� he said. �How do you do that by accident? It was a loud bang.�

Heavy armed police presence around Westminster this morning. Police are investigating after a man drove a car into security barriers outside Parliament. Suspect in custody. pic.twitter.com/hkZNmGie0Z

— Good Morning Britain (@GMB) August 14, 2018

The area was the site of a terror attack in March 2017, when Khalid Masood ploughed a car into crowds on Westminster Bridge, killing four people. Masood abandoned his car and then stabbed and killed a police officer before being shot dead in a courtyard outside Parliament.

(AP)