Cannabis plants worth £1.5 million were found during a raid of a former card shop in Rotherham town centre this morning.
Police officers discovered the drug den in a former Clinton Cards shop on College Street.
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Plants worth an estimated £1.5 million were found during the police raid.
Two men, aged 32 and 35, have been arrested on suspicion of cultivating cannabis and remain in police custody.
Officers expect to remain in the disused card shop for most of the day while the cannabis factory is dismantled.
Anyone with information should call South Yorkshire Police on 101.