PROVIDENCE, R.I. (WPRI) — Rhode Island State Police say they arrested eight people involved in an "elaborate illegal marijuana grow operation." The investigation began from an anonymous tip about drug activity spanning across locations in Lincoln, North Providence, North Scituate, Providence, Westerly and Woonsocket, according to state police. ALSO READ: Question 4 could legalize use of psychedelic substances in Mass. Investigators executed a search warrant last week and seized the following: Four firearms One large-capacity feeding device 279.4 pounds of usable marijuana 922 mature marijuana plants 859 immature marijuana plants One pound of marijuana shatter 468 grams of psilocybin mushrooms 11.1 grams of cocaine 65 Oxycodone pills 30 amphetamine pills one motor vehicle two motorcycles $79,876 in cash The suspects range in age from 26 to 59 and live in North Providence, Narragansett, Lincoln, Woonsocket, North Scituate and Charlestown. A North Providence man is facing gun charges, while he and the other suspects are all facing various drug possession and conspiracy charges. Courtesy Rhode Island State PoliceCourtesy Rhode Island State PoliceCourtesy Rhode Island State PoliceCourtesy Rhode Island State PoliceCourtesy Rhode Island State Police Close Thanks for signing up! Watch for us in your inbox. Subscribe Now Daily Roundup SIGN UP NOW