Prisoners at the Springhill Institution in Springhill, N.S. are on day two of a lockdown.

No one is allowed to leave their cell.

The prison announced the lockdown on Thursday but provided few details about what started it.

On Friday Shannon Oickle, with Correctional Services Canada, would only say the institution is undergoing an “exceptional search.”

She said she does not know how long the lockdown will last.

For prisoners that also means visits from family and friends have been suspended.