A police officer was rushed to hospital after being knifed while trying to arrest a suspect following a robbery in south London, Scotland Yard has said.
The officer was stabbed in the leg while attempting to detain a man outside a High Street pub in Sutton on Tuesday evening.
Police were called to reports of a knife-point robbery in the nearby St James Road shortly before 7pm.
After a search of the area, officers identified the suspect who fled on foot before being detained on High Street.
The male officer suffered a stab wound to the leg and was rushed to a major trauma centre, London Ambulance Service said.
His injuries have been described as not life-threatening.
A man was arrested on suspicion of causing grievous bodily harm and robbery.
He was taken to a south-west London police station where he remained in custody.
The alleged victim of robbery was also taken to hospital with minor injuries. He was not stabbed, police said.
Chief Superintendent Robyn Williams, Borough commander for Sutton, said: “Thankfully, incidents of this nature are rare. However, they highlight the risks officers face on a daily basis whilst carrying out their duties.
“Officers regularly run towards danger in order to protect the public; for one to be assaulted in such a way is totally unacceptable, and it is only by luck that his injuries were not more serious.
“Our thoughts are with the officer, his family and colleagues.”
Anyone who witnessed either the robbery or the stabbing and is yet to speak with officers is asked to contact police via 101. They can also call Crimestoppers anonymously on 0800 555 111