Police from three agencies say they broke up a “substantial” marijuana growing operation that was centered around a self-serve laundry in the Oxford County town of Porter.

An investigation into the growing operation led to the arrests of two brothers. Mark Viera, 54, and Richard Viera, 55, both of Kennard Hill Road in Porter. Both were charged with cultivating marijuana.

State Trooper Martin Royle and agents from the Maine Drug Enforcement Agency and the Oxford County Sheriff’s Office entered the storage areas of the Village Laundry on Wednesday and found evidence of a large marijuana growing operation, said Stephen McCausland, spokesman for the Maine Department of Public Safety.

A search of the laundry and several other locations in Porter led to the discovery of 11 pounds of processed marijuana and 109 plants, police say. The estimated street value of the drugs was $80,000.