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Federal agents raided eight large greenhouses filled with marijuana plants Thursday, breaking up what they termed the most productive and sophisticated indoor pot growing operation in the nation.

"This is undoubtedly the largest yielding indoor marijuana operation in the United States," said Larry Hahn, head of the Drug Enforcement Administration's efforts to wipe out such operations.Authorities said they found more than 2,500 marijuana plants in the eight greenhouses in Silverton, a small town about 25 miles northeast of Salem.

The wholesale value of the marijuana would be between $6 million and $12 million, Hahn estimated.

Related raids at seven other locations across Oregon turned up drug records, guns and small amounts of marijuana.

The greenhouse plants, planted in the ground, were generally four to six feet high and extremely thick and productive, the DEA said.