A boy in Saskatoon has been rescued as part of a multi-agency police investigation that targeted online child predators.

The Canadian Police Centre for Missing and Exploited Children says 21 people have been arrested and 16 of them have been charged as part of Operation Snapshot.

Ten of those charged are in Saskatchewan, four are in Alberta and two are in Manitoba.

The charges include Internet luring, indecent exposure and accessing and distributing child pornography.

Det. Sgt. Darren Parisien, who led the operation for the centre, says hundreds of thousands of images have been found on more than 100 computers and 1,000 disks.

Parisien says most of the children in the images were under the age of 12, but what's disturbing is that there are a number of infants and toddlers too.