A female police officer remains critically ill after being hit by a car driven by a man she was trying to arrest during a fraud investigation.
Det Con Catherine Corbett, 39, of Solihull, suffered head injuries in the incident in Hayes, west London.
The officer, who has been in the West Midlands force for 18 years, was trying to arrest the man when he escaped by car and knocked her over at 0800 GMT.
The Metropolitan Police is treating the incident as attempted murder.
Det Con Corbett underwent surgery at Charing Cross Hospital on Friday afternoon and her family are with her at her bedside, West Midlands Police said. The hospital is a specialist for neurosurgery.
Car abandoned
The suspect is described as being a white man aged in his 20s.
Meanwhile, police said a woman had presented herself to officers during the day and was being questioned about the incident.
Det Con Corbett, who was in plain clothes, was attempting to arrest the man outside the Sheraton Hotel, near Heathrow Airport.
The suspect crashed the car into a black Ford Focus, damaging its front bumper and bonnet, after the officer was struck.
Ervis Topalli, who works at a nearby car-wash, said one of the car's tyres was punctured in the collision.
He said: "I didn't think anything of it at the time. I thought it was just a car wheel spinning.
"But then I heard the noise of the brakes and the flap of the flat tyre and I wondered what was going on."
The suspect escaped in a blue Peugeot 207, which was later found abandoned in nearby Harlington Road.
Det Con Corbett was with other officers, two of whom suffered minor injuries.
A West Midlands police spokeswoman said: "[Det Con Corbett] was with a team from West Midlands Police in Hayes to effect an arrest in connection with an ongoing fraud investigation."
Det Con Corbett is a serving member of the economic crime team of the force.
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