A woman was raped by three men after she confronted them over a stolen cigarette lighter.
The 22-year-old had her lighter taken by the men at a bus stop on Roman Road, Bethnal Green, east London at 0100 GMT on 13 February.
When she tried to get it back she was dragged into Bethnal Green Gardens where she was attacked.
The suspects are described as two men of Mediterranean appearance and a dark-skinned man all aged 23 to 25.
Anyone with information about the incident is asked to call the Sapphire team - which deals with sex attacks - at the Isle of Dogs police station on 020 7275 4279.
Or if you wish to remain anonymous call Crimestoppers
on 0800 555 111.