Police have stepped up patrols in Sheffield city centre after two women were raped in the space of two days.
Detectives say the incidents, which both happened in the Arundel Street and Arundel Gates areas, are not thought to be linked.
In the first incident, a 22-year-old woman was attacked by a man in or around Arundel Gate between 2am and 3am last Sunday, October 11.
The suspect is described as mixed race, aged between 23 and 26 and of medium build.
He was with another man, described as white, who did not take part in the attack.
A second woman, aged 18, was raped in Arundel Street at about 2am on Tuesday.
Her attacker is described as white, 6ft tall and of skinny build with a deep voice and a northern accent.
He wore a black woollen hat, navy top, jeans and trainers.
South Yorkshire Police’s Det Insp Richard Partridge said: “The attacks on both women were very serious and, while we are continuing to follow a number of positive lines of enquiry, I would appeal to anyone who was in the area at the time to contact police.
“We are currently treating these incidents as separate and don’t believe they were committed by the same person.
“As you would expect, these investigations are being treated as a priority and officers are dedicated to finding those responsible.
“We continue to speak to both victims and have traced a number of potential witnesses.
“The attacks occurred at a time where there would have been a number of people in the area as they made their way home following a night out.
“Please cast your mind back – did you hear or see anything suspicious? Were you driving a taxi?
“Did you hear your passengers talking about anything that may relate to this incident?
“Your information could be vital no matter how insignificant you feel it may be.
“I appreciate that crimes of this type are deeply concerning and, while they are thankfully rare in Sheffield, we have increased patrols in the area and are doing everything we can to identify and arrest those responsible.”
Anyone with information is asked to contact South Yorkshire Police via the force’s 101 phone number or Crimestoppers anonymously on 0800 555 111.