Between about 3.15pm and 3.35pm on Tuesday (February 9) two nine-year-old boys were walking down Ingram Avenue when they were approached by a man who touched one boy inappropriately over his clothing.
The man then got into a car and drove away.
Police said the culprit is a man in his thirties with dark hair.
He was wearing dark clothing.
Investigating officer, Det Con Melissa Lee from the Child Abuse Investigation Unit based at Aylesbury police station, said: “If you witnessed this offence or have any information please contact police via the non-emergency number 101.
“We are conducting a thorough operation and urge any witnesses to come forward.
“We have carried out a house to house and officers have been conducting high visibility patrols in the area, to provide reassurance, to receive information and answer questions as appropriate.”
If you have information but don’t want to speak directly to police you can contact the independent charity Crimestoppers anonymously on 0800 555 111.
No personal details are taken, information is not traced or recorded and you will not go to court.