A police officer is in a life-threatening condition in hospital after being seriously injured in a road traffic incident while on duty, Thames Valley Police has said.
The incident took place in Stoke Poges, Buckinghamshire, at about 10.20 pm on Thursday.
Two men from Slough, aged 28 and 38, have been arrested on suspicion of attempted murder and causing serious injury by dangerous driving.
A 43-year-old man, also from Slough, has been arrested on suspicion of assisting an offender and perverting the course of justice.
Allen Horn, a 56-year-old local postman, said neighbours had heard a car, "but nobody saw anything as far as I know".
He added: "I came out in the morning, and the road is closed."
Matthew Barber, police and crime commissioner for Thames Valley, said: "My thoughts are with the officer, his family and his colleagues who will also be deeply affected.
"It is another stark reminder of the dangers that our police and emergency service colleagues face on a daily basis."
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David Moore, Conservative councillor for Farnhams and Stoke Poges, said: "I am deeply shocked and saddened to learn that one of our brave police officers is fighting for his life following this horrific incident.
"My thoughts and prayers are with him and his loved ones at this incredibly difficult time, and I wish him a full and swift recovery."
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