A woman had the top layer of both eyes burned off in an unprovoked chemical attack in south London by two females that left her temporarily blinded.
The victim, 21, had just left Croydon Tramlink, Mitcham, when she was approached by two women holding what appeared to be a water bottle.
Police said without warning, one of the suspects sprayed the contents of the bottle into her face, burning her eyes.
They then stole her purse which contained £15 in cash.
Despite her injuries, the victim managed to call 999 following the incident at about 16:00 GMT on 4 March. Her face was swollen and she had lost her sigh
The first attacker was described as a black woman with long wavy hair.
The second robber was also described as a black woman, with long hair and a fringe.
Det Con Simon Callcot, said: "This young lady has been subjected to an appalling and completely unprovoked attack which may result in her sight being permanently impaired.
Two people have been arrested and
bailed pending further inquiries.