Police investigating a number of incidents of sexual assault have arrested a 15-year-old boy.
Detectives had linked the sexual offences in the Clapham and Wandsworth areas of south-west London after they occurred over the past week.
The Metropolitan Police said on Wednesday that a 15-year-old boy was arrested on suspicion of attempted rape.
He is in custody at a south London police station.
In the first incident, a woman reported to police that she was being followed by a male in Battersea High Street at around 2.30am on May 11.
It is believed he also committed a sexual assault later that morning, when a woman in her 40s was attacked by a man in Clapham Common at around 4am.
It is believed the same male followed a woman in her 20s after she got off a train at Clapham Junction, then sexually assaulted her as she tried to enter a block of flats at around 11pm on Tuesday.
Officers have been carrying out extra patrols around the area to provide a greater police presence.