Several pedestrians were injured on Saturday after a car mounted the pavement near Natural History Museum in london, Scotland Yard said.
One person has been detained by Scotland Yard following the incident in Exhibition Road in South Kensington.
"It is believed that a number of pedestrians have been injured," Metropolitan Police said in a statement.
Officers are on scene, and the london Ambulance Service have been called, it said.
"A man has been detained at the scene. Enquiries to establish the circumstances are underway," the statement said.
It is not yet clear if what is being described as an "incident" by police is terrorism related.
The Met Police have also clarified that they have detained the man at the scene, rather than arrested.