A driver has been arrested on suspicion of terrorism offences after a car crashed into security barriers outside the Houses of Parliament at high speed. At least three people were injured when the silver Ford Fiesta hit a group of cyclists and pedestrians waiting for traffic lights to change. Witnesses said the car mounted the pavement on the wrong side of the road at up to 50mph and travelled around 40 metres (130ft) before hitting a bollard. Westminster was in lockdown as armed police swarmed the scene on Tuesday morning. Witnesses said they thought "it looked intentional - the car drove at speed and towards the barriers". Scotland Yard said a man in his late 20s was arrested after the incident at around 7.30am. The suspect was taken to a south London police station, where he remains in custody on suspicion of terrorist offences. He is not co-operating with officers. Police said the crash is being treated as a "terrorist incident" and the Met's counter-terrorism command is leading the investigation. Officers are seeking to formally identify the suspect, but "don't believe this person is known to either MI5 or counter terrorism police". Images showed a man being led away from the vehicle in handcuffs after armed police surrounded the car. #parliament #terrorattack #london