LONDON, Ont. -- Provincial police say 33 people are facing a total of 186 charges following a two-year investigation into illegal drug trafficking rings in southwestern Ontario.

The investigation dubbed Project Pinecreek began in 2012 and was expanded in July this year.

Police say "significant quantities" of methamphetamine and cocaine were being distributed in Huron, Lambton and Perth Counties.

The investigation led to search warrants being executed at 11 locations across the region.

Police say drugs seized included cocaine, methamphetamine, hydromorphone powder and various pills, along with about 20 kilograms of marijuana.

Restricted and prohibited weapons and about $22,000 worth of stolen property was also seized.

The 33 people are charged with drug and weapons-related offences, among other criminal charges related to the proceeds of crime.

Police say the investigation is continuing.