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PRENTISS, Miss. —Mississippi officials are uprooting what they’re calling the largest outdoor marijuana farm they’ve seen since the 1980s.

The Mississippi Bureau of Narcotics told local media that they got a tip that someone was growing marijuana in Jefferson Davis County, and that a helicopter found five fields of flourishing plants spread over more than 4 acres.

Director John Dowdy said Thursday that narcotics agents are cutting a road into the site with a bulldozer, removing the plants and burning some.

Agents estimate the marijuana could have been sold for at least $10 million.

An underground bunker and generators were also found, but authorities said they don’t yet know who was running the farm.