Several people have been injured after a car reportedly ploughed into people outside London's Natural History Museum.
Scotland Yard said that "a number of pedestrians have been injured" in an incident in Exhibition Road in South Kensington shortly after 2.20pm.
A Metropolitan Police spokesman said: "Officers are on scene, and the London Ambulance Service have been called.
"A man has been arrested at the scene."
Pictures and footage from the scene showed street damage and a massive police presence in the capital's museum district, home to the NHM, the Science Museum and the Victoria and Albert Museum.
The area is a magnet for tourists, including lots of children.
Afra Wang posted a picture of emergency services on Twitter, writing: "A crime scene? Full armed police locked the whole area out outside of @V_and_A in London. The helicopter above us doesn't seem to leave."