An eight-year-old girl has been killed and 10 people were taken to hospital after a Land Rover crashed into a girls' prep school building.
Detective Chief Superintendent Clair Kelland fought back tears as she announced the age of the victim during a press conference outside the school in Wimbledon, south London, on Thursday.
Chief Paramedic Dr John Martin from the London Ambulance Service said a total of 16 people were treated at The Study Preparatory School in Camp Road following the incident.
The Metropolitan Police said a woman in her 40s has been arrested on suspicion of causing death by dangerous driving and remains in police custody.
Ms Kelland's voice broke as she told reporters at the scene: "Very sadly one of the children, an eight-year-old girl, died at the scene.
"Our thoughts are with her family at this incredibly difficult time."
Dr Martin also gave an update at the press conference, saying: "At 9.54 we received a 999 call to a collision on Camp Road in Wimbledon.
"We dispatched multiple resources including specialist critical care paramedics, London's air ambulance and 15 ambulances.
"We declared a major incident. We treated 16 patients on scene. Sadly, as we've heard, one eight-year-old girl died."
