An anonymous bomb threat at Mt Eden prison has seen police clear public areas around the facility today.

Police said the "anonymous, non-specific" bomb threat was received about 10am.

A precautionary search was conducted and enquiries would be made into the source of the call, police said.

It was a non-visiting day for the prison and there was no disruption to the public or operation of the prison due to the scare.

Further details about the call would form part of an investigation and no further information would be released, police said.