In a terror attack, a man drove a car at high speed and ploughed into several pedestrians and cyclists before crashing into security barriers outside the UK's Parliament during rush hour today, injuring three persons, Scotland Yard said.
The attack, the second terrorism incident on the iconic building in central London since March last year, is being investigated by Scotland Yard's Counter-Terrorism Command.
The man, in his late 20s, has been arrested on suspicion of terrorism offences.
Metropolitan Police Assistant Commissioner Neil Basu, the National Lead for Counter Terrorism Policing in the UK, said the man was not cooperating with police as they work to establish his identity.
"Our priority is to formally establish the identity of the suspect and his motivation if we can. He is not currently cooperating," the Indian-origin officer said, adding that the suspect was not known to security services or under surveillance.
"There is no intelligence at this time of further danger to Londoners or to the rest of the UK connected to this incident.
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"Given that this appears to be a deliberate attack, the method and this being an iconic site, we are treating it as a terrorist incident," he said.
The suspect, who has not been formally identified, is being held at a south London police station.
BBC reported that the man is from the Birmingham area.
A Met police spokesperson said that there was nobody else in the vehicle, which remains at the scene and is being searched. No weapons have been recovered at this stage.
Police have put up a Terrorism Act cordon, a reaction to incidents of this nature near any high-security hotspots in the city.
"At 0737 hrs (1207 IST) today, a car was in collision with barriers outside the Houses of Parliament," the Met Police said.
The car was seen wedged into flap-style barriers that allows vehicles access to the House of Lords, giving the impression that the driver may have been trying to gain access to the Parliament building.
Prime Minister Theresa May said: "My thoughts are with those injured in the incident in Westminster and my thanks to the emergency services for their immediate and courageous response."