After speaking to the woman and reviewing CCTV footage, Suffolk police believe no crime took place in the area.
Detectives conducted further enquiries into the sexual assault which was reported as taking place in the early hours of Sunday August 12 in Ipswich in an alleyway off Upper Brook Street.
A spokesman for Suffolk police said: “These enquiries included reviewing extensive CCTV footage, interviewing witnesses, and also speaking at length to the woman who reported the incident.
“Through this work, police have now been able to reassure the woman that no crime took place as reported in this location.
“Police would like to thank the public for their assistance and would reiterate that all reports of this type are taken very seriously and thoroughly investigated.”
Officers are continuing to work with the woman who made contact with them.
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