Guelph police have arrested twenty people, following a search of two south-end residences and a sweep of four schools in the city on Wednesday.

The search of the two homes occurred around 10 p.m. and follows an investigation that began in April into a suspected marijuana trafficking operation.

A home on Clairfields Drive West, where the investigation began, as well as a home on nearby Doyle Drive were searched.

Guelph Police Sgt. Doug Pflug says "Drugs were stored there and transactions were made at those homes…we seized approximately $33,000 in marijuana, an imitation firearm, several machetes and a large quantity of cash."

Several pounds of marijuana were seized from each address and the cash, weapons, imitation firearms and drug paraphernalia were seized at the Clairfields residence.

Of the thirteen arrested in those searches, nine adults face charges ranging from possession, possession for the purpose of trafficking and trafficking. A youth arrested is not expected to be charged.

Bail hearings for those charged were held on Thursday.

Meanwhile a sweep of four Guelph high schools on Wednesday followed tips from students made to Crime Stoppers.

Seven students between the ages of 14 and 18 were arrested. They are expected to face suspensions, but no criminal charges.