Police are appealing for help finding a pair of teenage girls who racially abused a mother and daughter.
The incident, at Clapham Junction station on June 30, involved a 16-year-old girl and her 35-year-old mother from Croydon, who were waiting for a train on Platform 5.at 1.20pm.
The pair were approached by the teenagers who first began abusing the 16-year-old, before turning their attention to the mother, hurling abuse as the pair tried to move away.
Station staff intervened and the offenders boarded a train.
PC Michael Willoughby, from British Transport Police, said: "The victims felt intimidated and are still upset about this incident.
"We treat all racial harassment and threatening behaviour seriously, and are following several lines of enquiry in our investigation.
"I am keen to speak to anyone who witnessed this incident or has information about the identity of the two girls."
The girl who harassed and threatened the victims was around 17-years-old. She was approximately 5ft 2ins and had chestnut-coloured hair. She wore black glasses, a smart blazer, a green top, jeans and green sandals.
Her friend is described as around 16-years-old and chubby. She was approximately 5ft and had ginger hair worn in a bun. She wore a dark jacket, leggings and black trainers with white laces.
Anyone with information is asked to should call police on 0800 40 50 40, or text 61016, quoting reference SSUB/B3 of 17/07/2014. Information can also be passed anonymously to Crimestoppers on 0800 555 111.