Three men have been arrested after police found a large cannabis grow inside an abandoned building in Mansfield Woodhouse.
Nottinghamshire Police were called to the former Saville House School building on Church Street after reports of a strong smell of cannabis.
Officers forced entry and found metal barriers blocking access to doors and windows on the ground floor.
Three suspects were seen climbing onto the roof and were removed with help from Nottinghamshire Fire and Rescue Service.
Men aged 29, 24 and 22 were arrested on suspicion of producing cannabis.
Police say hundreds of plants were found inside and growing equipment will be destroyed.
Officers are urging people to report suspicious activity around large empty buildings.
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