Saturday's incident at about 14:20 BST on Exhibition Road initially sparked panic in an area popular with families and tourists. The area was cordoned off Saturday by heavily armed police, according to video posted on social media.
Mark added: 'I think everyone seems to be just trying to carry on as normal because no one knows what is happening'.
One person has been arrested at the scene of the incident, a press release by the London Police said without elaborating on further details.
The London Ambulance Service said in a statement that 11 people were injured, with mostly leg and head injuries, and nine people were taken to hospital. Their injuries are not believed to be life-threatening or life-changing.
A 47-year-old man was arrested at the scene on suspicion of risky driving after receiving treatment in hospital.
London Mayor Sadiq Khan also tweeted his thanks and hopes for a "swift recovery" for those injured. The incident is not terrorist-related, police said. The driver, Darren Osborne, 47, a resident of Cardiff in Wales, was arrested at the scene.
A auto mounted the pavement and ploughed into a crowd outside the museum in South Kensington around 2.21 p.m. BST on October 7. Photographs showed a dented silver auto and a man being pinned to the ground outside the museum.
The ambulance service sent multiple resources to the scene, including its hazardous area response team, ambulance crews, paramedics in fast response cars and incident response officers.
The Natural History Museum closed after the crash but its neighbor, the famed Victoria and Albert Museum, remained open.
But more than three hours after the incident, police said it was not being treated as terror-related.
A Downing Street spokesperson said British Prime Minister Theresa May is "being kept up to date on events".
The current terror threat in the United Kingdom is at "severe" - the second highest level - meaning an attack is highly likely. It's understandable if Londoners are on edge following the incident, as the city has been the target of several terror attacks in recent months.