London - Police arrested a man near London's Natural History Museum on Saturday after his vehicle mounted the pavement and ploughed into pedestrians, injuring himself and 10 others in an apparent road traffic collision unrelated to terrorism.Witnesses and footage posted on social media suggested the man was pinned down on the ground by passers-by in the busy tourist spot.Mounted the pavement"The incident is a road traffic investigation and not a terrorist-related incident," London's Metropolitan Police said in a statement."Whilst enquiries continue it is believed a car mounted the pavement and collided with a number of pedestrians".It said the arrested man was among nine people taken to hospital, while two others were treated at the scene. He is currently in custody at a London police station.No one is believed to have life-threatening or life-changing injuries.The area, which includes the wide, semi-pedestrian Exhibition Road which runs past the Science Museum and the Victoria & Albert Museum, is popular with families and tourists, particularly on a Saturday afternoon.Footage and photographs posted on Twitter showed the detained man next to a black car with its door open and its bonnet severely damaged. Witnesses reported by some media said they had heard a loud bang. Emergency servicesArmed police were deployed to the scene and the whole area was cordoned off.Security is high in Britain after five terror attacks since March - four of them in London and one in Manchester - with the bloodshed claiming 35 lives.Three of the attacks in London involved the use of a vehicle to plough into pedestrians.Prime Minister Theresa May offered her thanks to the emergency services, adding: "My thoughts are with the injured".