7 arrested, $15M worth of marijuana seized in bust - WKOW 27: Madison, WI Breaking News, Weather and Sports

OCONTO (WKOW) -- State and federal authorities uncovered a massive marijuana grow operation in Oconto County.

Officials say seven people were arrested as part of the investigation. Authorities also seized about $15 million dollars worth of marijuana that was growing in the Chequamegon-Nicolet National Forest.

Official announced the bust on Wednesday, but the suspects were arrested over the weekend. 

Ed Wall of the state Division of Criminal Investigation says the investigation began in June after a tip from a fisherman. About 200 federal, state, tribal and local officers have been involved in the case. Investigators are still trying to find out how long marijuana was being grown in the area along the South Branch of the Oconto River.

Wall says about 15,000 plants were seized. He says they were in good condition and some had already been harvested.