Police are asking for a member of the public who came to an officer’s aid when she was violently assaulted during an arrest, to come forward.
At around 18:40hrs on Friday, 14 June two officers in a marked police car were approached by another off duty officer in High Road, Streatham, and informed of two suspicious teenagers seen abandoning a moped nearby.
The officers spotted the suspects boarding a bus towards Brixton and followed it.
The suspect pair became aware of the officers following them and then left the bus.
One of the suspects made off and was pursued by one officer, a 24-year-old woman, onto Hopton Road, where she detained him to be searched.
He immediately became aggressive and violent, grabbing her hair and striking her head against a wall multiple times before throwing her to the ground.
At this point a member of the public came to the officer's aid and assisted in detaining the male so that handcuffs could be applied and prevent him causing any further harm.
The member of the public then left the scene before any of his details could be taken.
Police would like to speak to the man as part of their investigation and ask him to come forward. He is a witness and is in no way considered to be a suspect in the incident.
He is described as a white man, of slim build, and may have been wearing glasses.
The officer was taken to hospital; she suffered cuts and bruises to her face, knees and arms and potential whiplash injuries, but is otherwise not seriously injured.
The arrested male, aged 15, was arrested on suspicion of assaulting emergency worker x2, theft of a motor vehicle and taken to a south London police station, where he remains.
The other teenage suspect was also arrested on suspicion of theft of a motor vehicle and remains in custody.
If you are the member of the public referred to, or you know who he is, please call police on 101 quoting CAD 7003/14JUN19, or attend your local police station.