Guernsey Police are investigating the alleged indecent assault of a boy at the Sark Music Festival.
Police say it happened in a public area of the SarkFest event early in the evening on Friday 8 July.
Officers say the suspected perpetrator was a man.
No further detail or description has been given.
They want to hear from anyone who witnessed what happened, or has any information about it.
Guernsey Police can be contacted on 01481 222222 or anonymously through Crimestoppers on 0800 555 111.