Two women have been assaulted in separate incidents in Lincoln.
Both women were approached by a man while they were walking home alone in the early hours on Saturday.
The incidents took place in Carholme Road and Newland Street West.
On both occasions the women challenged the offender and he ran off, but neither victim was hurt.
The suspect is described as white, in his mid to late 30s and around 5ft 5ins to 5ft 6ins tall with short, brown hair. He was wearing casual clothing.
DI Suzanne Davies, of Lincoln CID, who believes the incidents could be connected, said: “I am appealing for anyone who was in the area in the early hours of Saturday morning to contact me if you saw a lone male hanging around the area between 1.30am and 2am on Saturday.
"I am particularly trying to contact a man and woman asked one of the victims if she was okay and needed any help in Drake Street. They may have information that could help us.
"I would like to reassure the public that these are unusual attacks but I would urge friends to walk home together after a night out or share a taxi."
Anyone with any information can contact DI Suzanne Davies directly on 01522 885230, or call the non-emergency number 101. To give information anonymously call independent charity Crimestoppers on 0800 555 111.