Police are hunting a hooded flasher who gave a woman a fright as she was jogging.
The man flashed the woman and then touched himself inappropriately as she approached Park Street Bridge.
It happened on the tow path between Park Street and Walton Street in Aylesbury shortly after 9am on Saturday.
The man was white, in his 30s, between 5ft 7ins and 5ft 8ins and of average build.
He was wearing a dark-coloured baggy tracksuit with the hood up.
If you have any information, contact PC Laurence Spring on 101.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.