Two police officers were critically injured after they were hit by a Maserati while walking back to their vehicle in north-west London.
The two PCs were returning to their marked car on the A406 North Circular Road in Brent Park, Neasden, at about 03:40 GMT when they were struck.
The male driver of the white luxury car was arrested at the scene.
Scotland Yard said one officer remained in a critical condition while the other was seriously injured.
A406 East bound re-opened, traffic flowing, very heavy residule traffic in the area.— Brent MPS (@MPSBrent) December 17, 2017
Officers remain in critical condition, next of kin in attendance.
Thank you for your kind words.
A spokesperson said the officers, both aged in their 30s, had been at the location assisting with inquiries into an unrelated matter.
They said the male officer was critically injured while the female officer sustained a number of fractures and is in a serious but stable condition.
A woman who was inside the Maserati was also taken to hospital but was not seriously injured.
The driver, aged in his 50s, was arrested on suspicion of dangerous driving and failing to provide a breath specimen.
He remains in custody.
Met Commissioner Cressida Dick said her "thoughts and prayers are with my officers".
"It is incidents such as this that act as a stark reminder of the uncertainties of police work and the dangers that officers face every day," she said.