Crookes residents have been warned to be vigilant after a woman was sexually assaulted on Conduit Road on Sunday.
The man, who is thought to be in his late 20s or early 30s, approached the victim as she walked along the road at around 11.55pm and assaulted her.
He made off in the direction of Crookesmoor Road / Northumberland Road. The man was white, around 5ft 9ins tall, and was dressed in dark clothing.
Please take extra care if you live or work in this area. If you have any concerns, you can talk to University security colleagues on 0114 222 4085.
If you recognise the man or were a witness call South Yorkshire Police on 101, quoting incident 1 of 11 April 2016. Alternatively, call Crimestoppers anonymously on 0800 555 111.