One man was detained after a number of pedestrians were injured in a collision with a auto near the city's Natural History Museum on Saturday, and London police said they were trying to determine the circumstances.
Police, who were called to reports of a collision in Exhibition Road at 2.21pm, confirmed that they have a man under arrest and are working to establish a motive.
A Met police spokesperson tells CBS News that officials don't know yet whether the incident was related to terrorism.
One man has been detained in the crash.
One man has been detained at the scene.
Most of those hurt were treated for leg and head injuries.
The incident aroused bad memories among many people in London: Britain has already become target of a terrorist attack five times this year.
The Natural History Museum, a few blocks away from Hyde Park, is popular with locals and tourists alike and the area was busy with pedestrians braving a chilly autumn day in London.
Downing Street said Prime Minister Theresa May was being kept up to date with developments.
Witnesses described a rush to leave the scene, nearby shops were evacuated and the sprawling museum, a favorite site for families with children, closed down early.
Vehicles have been used before to target pedestrians in London, including at London Bridge in June which claimed eight lives. "It is a road traffic collision", they said.
A man was detained following an incident involving a vehicle and pedestrians in central London Saturday, according to police. A man was detained an now under arrest. He says "It was quite scary".
London police have not said if this incident is related to terrorism. Police stand guard next to the Natural History Museum.
The Natural History Museum is the fourth most popular tourist attraction in the United Kingdom, with 4.6 million visits during 2016, according to the Association of Leading Visitor Attractions.