KITCHENER, Ont. - Police say a dozen people are facing charges in Ontario after a year-long international investigation into cocaine smuggling.

RCMP say the investigation began in the spring of 2016 and focused on the importation of cocaine into Canada from the U.S. on commercial trucks, allegedly organized by a group of people in Ontario's Waterloo Region.

Police allege the accused were involved in the logistical side of the operation, arranging for the transportation of the cocaine through the U.S. and across the border into Canada by hiding it in loads of legitimate cargo.

Officers executed a total of 14 search warrants in the Kitchener-Waterloo, Ont., area, Toronto and Leamington, Ont., seizing 38.5 kilograms of cocaine.

The Mounties say 12 people -- from Toronto, Cambridge, Ont., and Thornhill, Ont., Kitchener, and Leamington -- are charged with importing a controlled substance into Canada, and conspiring to import a controlled substance.

The joint investigation involved the RCMP, Waterloo regional police, Canada Border Services Agency, U.S. Homeland Security Investigations (HSI), and the U.S. Drug Enforcement Administration.