An annual police surveillance program known as the Operation SABOT uncovered three marijuana grow operations in Alberta and Saskatchewan last month.

The team, made up of members from the RCMP and Edmonton Police Service, used military helicopters to look for grow ops in northern Alberta.

The largest operation was discovered on a rural property near Valleyview, Alta. where police found 2,984 plants. 

The plants were grown inside a steel building with high intensity lights, diesel generator and an odour-masking filtration system. They were grown outdoors as well.

Police arrested three men who were on site and charged them with trafficking offences.

Another 584 plants were seized at two grow ops discovered in northwestern Saskatchewan.