Nine sex attacks took place in a city park in the space of just five hours, police say.
The assaults happened in and around Singleton Park, Swansea between 08:00 GMT and 13:00 on Friday, South Wales Police said.
A 24-year-old man, who was arrested on Friday, has been released with no further action.
A cyclist who was captured on CCTV has been urged by the force to come forward.
“We appreciate these incidents are concerning to local residents who are regularly using the park during lockdown,” Det Insp Peter Collins said.
“We are taking this very seriously and our investigation is ongoing. We also have extra patrols in and around the park.”
He urged anyone with any information to contact the force.