Detectives investigating an attempted robbery in Lambeth are appealing for a victim of crime to come forward.
The attempted robbery was witnessed by two plain clothes officers who were on patrol.
They were travelling in a car on Kennington Lane, SE1, at about 23:00hrs on Wednesday, 29 June, when they witnessed two males approach a female from behind and push her.
They then attempted to snatch her handbag off her shoulder.
The two officers got out of their car and arrested a 13-year-old boy [A] on suspicion of attempted robbery.
More officers attended and, following a short chase, arrested a 17-year-old boy [B], on suspicion of attempted robbery.
They were taken to a south London police station where they remain in custody.
The victim managed to keep hold of her handbag but left the scene before officers had the chance to speak to her.
Detectives are now appealing for the victim to contact the police.
The victim is described as a white woman, with dark hair carrying a white tote-style shoulder bag.
DC Claire Spivey from Lambeth CID said: "We would appeal for this woman to come forward so we can take a statement from her and bring those responsible to justice.
"I would imagine the incident left her quite shaken up and because the officers who intervened were in plain clothes she probably did not realise that officers were on scene."
The victim, or anyone with information, is asked to contact Lambeth CID on 07785 774 447 101 or Tweet @MetCC.