Police are investigating whether more than one person could be responsible for a spate of sex attacks that have taken place in Denaby Crags.
Six sexual assaults on women have been reported in the area since April this year, and officers now believe it is possible they were carried out by more than one person.
A number of people have been arrested in connection with the incidents and one man remains on police bail.
Police have carried out extensive enquiries and high-visibility patrols in the area.
The force’s Dog and Mounted Sections have also been utilised in patrols of the area, as well as specialist search teams and the force helicopter, to ensure people are safe.
Detective Inspector Jade Brice, who is leading the inquiry, said: “We have taken significant steps to make sure that this person does not hurt anyone again and continue to have a major presence around the Craggs area to prevent further incidents and to find the person responsible.
“We are keeping an open mind, but it’s possible that the six offences were carried out by the same man. We have two efit images of suspects that have been released to the public who look very similar, and we’ve received a good response so far.
“However, no one has been charged in connection with this and I would still like to appeal to the public to come forward if they have any information. I’m confident that someone knows, or has a suspicion, who could be doing this.”
The man is described as being white, with dark hair. He speaks English and has been reported to smell of alcohol.
In the most recent assault, the attacker also had a noticeable, sore looking spot to the right side of his nose which was clearly visible beneath stubble.
The first assault occurred on April 4, when a 13-year-old girl was assaulted by a man as she walked through the Crags at around 7.35am.
Then on June 12, a 51-year-old woman was assaulted in the Craggs by a man at around 6.25am. He ran away after being disturbed by a passer-by.
A 38-year-old woman was assaulted by a man in the area on July 11 at around 8.30am.
A man was arrested in connection with this incident. He has not been charged and currently on bail.
On August 13, a 23-year-old woman was assaulted by a man as she walked up Wadworth Street, which is at the bottom of the Craggs, at around 6.55am.
She managed to break free of him and ran away.
A man also assaulted a 26-year-old woman on September 27 as she walked from Denaby Avenue through the Craggs at around 2.20pm.
And in the most recent incident, a 26-year-old woman was assaulted on November 20 at around 2.20pm. A man dragged her from behind and attempted to assault her before she managed to make her escape.
DI Brice continued: “The victims in these incidents were understandably shaken and distressed by what happened to them but the response from the local community has been overwhelming and everyone has really come together.
I urge people to continue to support our investigation by sharing any information they have that could help us.”
Anyone with information should contact South Yorkshire Police on 101 quoting incident 574 of 20 November 2014. Alternatively, call Crimestoppers anonymously on 0800 555 111.