A police officer who was critically injured after being hit by a car which failed to stop has been named.

PC Christopher Miller, 38, was taken to hospital after the incident on the B416 in Stoke Poges, Buckinghamshire, on Thursday night.

Two men aged 28 and 38, both from Slough, were arrested on suspicion of attempted murder and causing serious injury by dangerous driving.

A 43-year-old man was detained on suspicion of assisting an offender and perverting the course of justice, and on Sunday, a 37-year-old woman from Slough was arrested for these same two offences.

Thames Valley Police said the incident happened at about 22:20 BST when a white BMW hit the officer and failed to stop.

The force described his injuries as “life-threatening” and said his family and close colleagues were being supported by specially-trained officers.

The 43-year-old man who was arrested has been released on police bail, while the other three detained after the incident remain in custody.

Deputy Chief Constable Ben Snuggs said: “Police officers face danger every day.

“In this incident, PC Christopher Miller was simply doing his job, serving the public and keeping our communities safe.

“We have all been affected by this, right across Thames Valley Police.”

Senior investigating officer Det Supt Will Crowther appealed for anyone with information to come forward and said: “I believe the BMW will have had front-end damage after the incident, and so if you saw the vehicle, either before the incident or afterwards, please contact us.”