Photo: Facebook Christian Allen Sarile

A former Calgary teacher has pleaded guilty to 17 sex-related charges involving girls.

Christian Allen Sarile had been arrested on 49 charges including sexual assault, sexual interference, accessing child pornography, distributing child pornography, luring and extortion.

All of the victims were between the ages of 12 and 17 and are from the Calgary area.

Police say Sarile used social media sites to pose as a teenager asking to meet girls.

Investigators say he would ask the girls to chat through various social media platforms and then offer them cash or items in exchange for sex or compromising photos.

A sentencing date has not been set.