Const. Wendy Drummond said the raids were part of an operation known as Project DOMO that began last September and wrapped up on Tuesday.
“It's been a very successful project,” Drummond told CBC News.
“We’ve got over $1 million worth of drugs that have been seized.”
Drummond said that cocaine and methamphetamine were among the drugs seized during the raids, as were nine firearms.
While police executed 29 search warrants in Toronto, York, Durham and Waterloo regions on Tuesday, Drummond said additional search warrants were executed earlier this year as part of the same project.
Police have scheduled a news conference for Wednesday afternoon in which they will release further details about the raids that took place on Tuesday.