Thames Valley Police is appealing for witnesses following a series of indecent exposure incidents in Aylesbury and Wendover.
Between 16 August and 20 October, officers have received nine reports, which are being investigated as linked, of a male who removed his trousers and touched himself inappropriately in front of women and girls.
The incidents have taken place in Heron Path in Wendover, Sandhill Way in Fairford Leys and around Meadowcroft. These have been on White Path, near to the old Aylesbury United Football Club and two other parks off Meadowcroft.
All nine of these incidents have taken place on weekdays and five have been before 8.45am, two of them being witnessed by teenage girls on their way to school.
The suspect is described as a tanned man aged between 18 and 30. He is between 5ft 5ins and 5ft 8ins tall and is of a medium build. He has dark hair and a beard and often wears a blue hooded top.
Neighbourhood Inspector for Aylesbury Vale, James Davies, said: “This is a concerning series of incidents that will naturally be alarming for local residents to hear about.
“We will be patrolling more regularly in Meadowcroft and Wendover and I encourage anyone who witnesses an incident like this to call us on 999. This is a crime in progress and so it is appropriate to use our emergency line.
“With nine incidents reported to us, this is a concerning pattern of behaviour and there may be incidents that have not yet been reported to us. I want to encourage any victims who have not yet contacted us to do so.
“Investigators are following a number of lines of enquiry and I encourage anyone with any information or who may have witnessed a previous incident and not reported it to get in touch using our online form, quoting reference number 43220409793.
“As a neighbourhood team, we work closely with our partners to make sure everyone can feel safe in the Aylesbury Vale and we are reviewing what can be done at the locations that this male is frequenting.
“We also regularly review data submitted via the national StreetSafe reporting tool that allows you to anonymously flag areas where you feel unsafe to the local Community Safety Partnership.”