Police are trying to trace a man who flashed at two groups of children and a woman in Kimberley.
The first incident took place at about 6pm on October 19 near to the bridge over the A610 in Knowles Park, Swingate.
Six 12-year-old girls were sitting on the swings when a man approached and exposed himself.
The second incident happened at around 8.30am on Monday November 12 in Hardy Close.
Three 12-year-old girls were walking to school. When they crossed the railway bridge, towards Chilton Drive, they noticed a man behind them. He exposed himself then fled.
A 35-year-old jogger was the next victim just before 8pm on Tuesday November 13. She was running along Eastwood Road when she saw a man, in a driveway with his trousers round his ankles, exposing himself.
In all three incidents the man is described as fair skinned, either white or mixed race. He is 5ft 6ins to 5ft 10ins tall, in his 20s and of average build. He wore a dark-coloured Adidas tracksuit and a hat.
Police also want to trace a man involved in a fourth incident which happened outside Kimberley School, in Newdigate Street, at around 3.45pm on Monday November 12.
The man, believed to be drunk and clutching a bottle, exposed himself to a group of children after asking them to fight him.
He is white, with tanned skin and aged in his 40s. He has longish, greasy, dark hair. He was wearing a green jacket, black trousers and scruffy shoes.
He boarded a bus towards Nottingham city.
Although he does not match the description of the man involved in the other incidents, police are still keen to speak to him.
Neighbourhood Inspector Craig Berry said: "The man (involved in the first three incidents) did not speak to or make physical contact with any of his victims. They were obviously shaken by their ordeal, but thankfully uninjured.
"We are working closely with the local school and increasing patrols in the area as a result of the incidents.
"I would encourage parents and guardians to ensure your children are aware of the Stranger Danger principle and report any suspicious incidents of this nature to us immediately."
Anyone who has been subject to a similar incident or those with any information about the suspect/s should contact Nottinghamshire Police on 101 or call Crimestoppers anonymously on 0800 555 111.
