A man has been arrested on suspicion of attempted murder after two police officers were struck by a car in Sussex.
A man who was with the officers was also hit by the Mercedes-Benz saloon car in the early hours of Monday morning.
All three were taken to hospital to be treated for serious injuries.
Police are investigating the incident in Littlehampton as a deliberate act.
The officers, a male and a female, were carrying out a routine drugs check at the side of the road when the car struck them and the man they were with at speed.
The driver of the Mercedes-Benz, aged 20, ran off but was stopped and arrested by officers on suspicion of attempted murder.
Two passengers also ran off and remain outstanding.
Assistant Chief Constable Julia Chapman said: “This is being investigated as a deliberate attack on two police officers in the course of carrying out their duties.
“Their injuries, and that of the man they were with, whilst serious, are not believed to be life-threatening.
“Two passengers in the car remain outstanding and we urge the public to help us trace and bring to justice all of those involved.”
The officers had detained a man on suspicion of drug offences at the side of the road before they were struck by the car.
The road was closed for the scene to be secured and examined.
It comes as three teenagers were charged the murder of PC Andrew Harper, who was hit by a car while investigating a burglary in August.
:: Anyone who saw what happened in Littlehampton or has any other information is asked to contact the police online or by calling 101, quoting Operation Oxbridge. Or they can contact Crimestoppers anonymously on 0800 555 111.