A Southwark police officer is in hospital with a broken leg after an incident in Bermondsey in the early hours of Friday morning.
Officers on routine patrol spotted a black VW Golf drive through a red light in Dunton Road at about 1am.
The car then stopped at the end of the close and the driver, a 26-year-old man, ran away pursued by a police sergeant.
His colleague, a male police constable, went to the car to try to stop the three passengers from escaping.
The officer attempted to arrest the 26-year-old man and during a struggle on the ground his right leg was broken.
He has been taken to a central London hospital where it has been confirmed that he has a double break of the leg that will require surgery. He remains in a stable condition.
More officers then arrived and the 26-year-old man was arrested on suspicion of possession of a class A drug, assault with intent to resist arrest and drink-driving.
Two of the male passengers were arrested at the scene on suspicion of possession of class A and B drugs. They are currently in custody.
The third male passenger escaped from the scene.
"I am proud of all my officers who put themselves at risk every time they go on duty to ensure the safety of Southwark's communities," says Chief Superintendent Wayne Chance, Southwark borough commander.
"It is always upsetting when one of them is injured.
"Everyone on the borough wishes this officer a speedy recovery and he will be offered all the support he needs to get back to full health and back on duty."