London's Metropolitan Police said the incident, the latest apparent attack on Britain in the last 18 months, was being treated as a terrorism incident. "The male driver of the vehicle was detained by officers at the scene", Scotland Yard said in a statement.
In a tweet, the Metropolitan Police stated that two pedestrians are injured.
While such a project presents challenges, Khan said, "it's possible to have a design solution that meets the objectives.in relation to keeping our buildings and our people as safe as we can do, but also not losing what's wonderful about our city which is a vibrant democracy".
Police said that the driver of vehicle, a man, was arrested at the scene after the incident which took place at 7.37am in London on Tuesday (1.37pm in Thailand).
"Police are now working to formally identify the man and determine his motives", he said.
The investigation is being led by the Met's Counter Terrorism Command, with support from the wider counter terrorism policing network.
Two people were taken to local hospitals after the auto crashed near the Houses of Parliament on Tuesday, but authorities said the injuries aren't believed to be life-threatening.
Moment after the auto crashed.More news: Rupee breaches 70 per dollar mark as Turkey concerns persist
"I was walking on the other side [of the road]".
Barry Williams, a BBC member of staff based at Millbank, said: "I heard lots of screams and turned round".
Bus driver Victor Ogbomo, 49, was driving passengers past the front of Westminster when he saw the crash. "It's absolutely unbelievable there was only one cyclist seriously injured, he went straight through them".
"Then the police just jumped".
"I'm sure that when they do get more information they will say more". I saw at least 10 people lying down. ISIS claimed the 22-year-old British perpetrator of Libyan descent as one of its own.
Police activity in central London on Tuesday.
Sky's political correspondent Tom Parmenter said "the police response is very significant", with more officers arriving at the scene.
Eight people were killed on June 3 when a van plowed into people on London Bridge before the three attackers carried out a knife rampage in Borough Market. He was shot dead at the scene.