Police investigating a suspected hit-and-run in which an officer was critically injured have been given more time to question two suspects.
PC Christopher Miller, 38, has been in hospital with life-threatening injuries since the incident on the B416 in Stoke Poges, Buckinghamshire on Thursday night.
Two men, aged 28 and 38, from Slough, Berkshire, were arrested on suspicion of attempted murder and causing serious injury by dangerous driving.
Thames Valley Police said the suspects remained in custody after a warrant of further detention was granted.
The force added that a 37-year-old woman from Slough, Berkshire, who had been detained on suspicion of assisting an offender and perverting the course of justice, has been released on police bail.
A 43-year-old man detained for the same two offences has also been released on police bail.
The incident happened at about 22:20 BST when a white BMW struck PC Miller and failed to stop, police have said.
His injuries were described as “life-threatening” and his family and close colleagues are being supported by specially trained officers.
