Nine people have been arrested in a police raid on the Heřmanice prison house in Ostrava. Officers have been searching the premises and questioning employees since Friday night. The director of the prison house said he was fully cooperating with the authorities but refused to provide any details. According to the daily Právo the raid is linked to the suspect business activities of several prison guards who may have assisted in scam practices at a nearby scrap metal yard where prisoners from the jailhouse are employed. In view of the ongoing investigation the police have not released any details on the case.