A man has been arrested on suspicion of attempted murder after a police officer was left with potentially life-changing injuries following a car crash in Southwark, south London.
Three other officers were injured in the collision and another during the arrest.
A police statement said: "A police vehicle was involved in a collision with another car shortly before 1.30pm on Tuesday, October 20 in Draycott Close near to the junction with Edmund Street, SE5.
"The driver of the police vehicle remains in hospital with potentially life changing injuries. Another officer also remains in hospital with injuries that are not believed life-threatening or life-changing.
"Two other officers have been discharged with minor injuries. Another officer sustained minor injuries in the arrest.