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CCTV images have been released following the sexual assault of a girl near Reddish Vale Country Park.
Sometime between 5.30pm and 6pm on Friday 24 June 2011, the victim, a 10-year-old girl, was approached by the offender.
He grabbed the girl and sexually assaulted her.
He tried to prolong his attack but the victim managed to kick herself free and run away towards the nearby visitors centre.
It is believed the offender may have spoken to a woman pushing a pram near to Houldsworth Medical Centre just before the attack.
The offender is described as being as a white man, 5ft 8in to 5ft 9in tall, and in his mid twenties. He had stubble and an oval shaped face. He spoke with a local accent.
He was wearing a black baseball cap, a zipped black jacket and black tracksuit bottoms. He was also riding a red and silver mountain bike and wearing Reebok trainers.
Officers are also investigating a second incident, at about 6.30pm on the same day.
The offender approached a 12-year-old girl on Brinnington Road. He made indecent gestures and towards the victim who ran away.
The offender is described as being a white man, about 19-years-old, with mousey hair. At the time of the incident he was wearing only a pair of underpants.
Chief Inspector Gary Simpson said: "The CCTV images may help us track down the man responsible for the first incident.
"We would urge anyone who may recognise him to contact us.
"We are thoroughly investigating both incidents, but while these inquiries continue we would urge members of the public to be vigilant.
"We do not want to alarm residents and users of the park, all we ask is they take extra care in the area.
"To help, police patrols in the area have been stepped up.
"Police community support officers and neighbourhood officers are on hand to offer reassurance and address any concerns people may have.
"The two incidents happened within a mile of each other but at this time they have not been linked, although we are keeping an open mind as to whether or not they may be."
Anyone with any information is asked to call police on 0161 872 5050, 0161 856 9840 or call the independent charity Crimestoppers anonymously on 0800 555 111.