It was reported that at around 12.30pm on Sunday, November 3, the girl was approached by an unknown man at Alver Valley Country Park, Lee-on-Solent, before she pushed him away and ran to safety.
Officers arrested a 42-year-old man from Gosport on suspicion of sexual assault.
However, in an update to the investigation, police confirmed they have since released the suspect from custody with no further action being taken against him.
In a statement, a spokesperson for Hampshire Constabulary said: “Yesterday (Saturday, November 9) we arrested a 42-year-old man from Gosport on suspicion of sexual assault on a female under 13.
“Following extensive enquiries carried out yesterday and overnight, he has now been released from the investigation with no further action to be taken against him.
“Detectives investigating this incident are continuing their enquiries today, including an extensive review of CCTV in the area and speaking to witnesses.
“We believe there are people who will have been in the area at the time of the incident who have not yet spoken to us.
“The area in which this occurred is a popular country park, which is used in particular by dog walkers, and we believe it would have been relatively busy on that afternoon.”
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The man involved is described as white, aged between 50 and 65, 5ft 8ins tall, and of skinny build.
He’s reported to have a scruffy beard, shoulder length brown hair with some grey, and was wearing a light red jacket/fleece and grey trousers.
The incident is described as occurring in the woods near to the west car park, next to a blue pole with a yellow sign.
The spokesperson for Hampshire Constabulary added: “Were you in the park at around 12.30pm?
“Perhaps you were filming or taking photos on your phone and may have captured something suspicious or a man matching the description above?
“Or were you driving in the area and have dash cam that may have captured something that could assist our enquiries?
“Anyone with information is asked to contact police on 101, quoting 44240479687.”
