A police investigation has been launched after a 19-year-old man was raped in Manchester city centre.
Police have released CCTV images of a man they want to speak with.
The attack happened in April, but details have only just been released by Greater Manchester Police detectives.
They said they have followed 'every single line of enquiry available', but the rapist hasn't yet been traced.
Officers are now appealing for the public's help.
Detective Constable Sarah Dixon said: "The victim has sadly had to already wait three months knowing the person responsible for this has not been arrested and is not facing the consequences of this abhorrent crime.
"Please, help us in our aim to provide him with answers."
Police were called to Waterloo Street - off Princess Street - at 4.40am on Friday, April 12 after reports the 19-year-old had been raped.
GMP said he was approached by another man outside Cruz 101 nightclub who asked him if he knew a 'quiet place' where he could urinate.
The teenager told him no and that he was walking home.
But police said the man walked with him before attacking him on the street at the ramp of a car park.
A GMP spokesman said: "Since the time the report came in, officers have been examining CCTV footage to establish the exact circumstances surrounding the offence and identify the man responsible.
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"Other enquiries, which have taken some time, include forensic analysis but unfortunately, this has not resulted in a positive identification of the offender.
"The 19-year-old man has been supported by specially trained officers since April and officers are now turning to the public to help them provide answers for him.
"CCTV released by investigating officers shows a man they want to speak to in connection with the investigation."
Det Con Dixon added: "Since the report came into us in April, we've been following every single line of enquiry available to us but unfortunately, we've not yet been able to find the man responsible.
"While people may not remember what they were doing on the night of Friday April 12, or whether they were in the area at the time, I'm hoping that by releasing this CCTV, people will recognise the man we want to speak to in connection with this and get in touch with us.
"We really need people to pass on any information so that we can progress our enquiries further."
Call police on 0161 856 4409 or the independent charity Crimestoppers on 0800 555 111.
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