Police have launched an appeal for any information following the rape of an 18-year-old woman in Manchester city centre.
Another woman, also 18-year-old, was sexually assaulted.
Reports of the attacks were received by police just after 2:20am on Granby Row, Manchester on Sunday 25 June.
Police are appealing to all those who may have been in the area at the time to come forward with any information.
The victims were approached by two men on Chorlton Street before walking to Granby Row, where the incident took place.
Granby Row links Princess Street to Piccadilly and is near popular nightclubs Fifth and Factory.
Two passers-by intervened and the men involved ran away. Both have been described to police as black and in their 20s.
Police presence in the area has been increased to provide reassurance to the local community.
Detective Sergeant Clare Smith, GMP’s Serious Sexual Offences Unit, said: “This incident has understandably left both women extremely distressed.
“We are providing them with support from specially trained officers.
“We are actively seeking potential witnesses to this disturbing incident and I would ask that anybody who has information to please come forward.
“This happened following a busy Saturday night in Manchester and it is possible that there could have been a number of people in the nearby area at the time that may hold key information.
“If you have any concerns then I would encourage you to approach one of our officers on patrol.
Anybody with information should call police on 0161 856 1911 or 101, quoting incident number 358 of 25/06/17.
Alternatively they can contact independent charity Crimestoppers, anonymously, on 0800 555 111.