Police are investigating allegations of historical sexual offences against children at a school in Hassocks in the 1970s.
A report has been made by a former pupil of Hassocks Windmills Primary School that a member of staff may have behaved inappropriately and committed offences.
Officers said the allegations are not connected to anyone currently at the school.
DC Martin Alchin-Gadd, of the Safeguarding Investigations Unit, said:
“These offences are alleged to have taken place at a time when attitudes to sexual offending were very different and possibly not even recognised as such.
“However, they are potentially criminal and even now may still be affecting those who may have been involved.
“I would urge anyone with information to come forward.”
No arrests have been made at this stage.
Detectives working on the investigation are keen to trace anyone who went to the school during the early to mid-1970s, and may have witnessed any offences.
Anyone with information is asked to contact Sussex Police online here, quoting 1504 of 21/2/17.