Two 15-year-old girls are already in custody, charged with luring girls — one as young as 13 — through social networking sites, then turning them over for prostitution with adult males.
One of the accused was in court Tuesday, the other is due in court on Wednesday. The third suspect, 17, is still at large.
"It's terrible," said Staff Sgt. John McGetrick, who called an impromptu news conference Tuesday to better deal with the crush of media attention the case is getting.
"Our folks deal with disturbing investigations every day, but this one is shocking."
Police allege that on three separate occasions, the three accused used social media to contact three female victims ranging from 13 to 17 years of age. After meeting at a residence, they then took the girls to other locations for the purpose of prostitution.
He said the victims and suspects met online, but may have "distantly" known one another.
McGetrick made a point of telling parents to pay close attention to what their kids are doing on Facebook, Twitter and other popular social media services.
"Know who your kids are talking to online," he said.
"If they are going to meet someone you're not familiar with, ask them: 'How did you meet them? Did you meet them online? What did they say?'
"If I'm a parent, I'm going to have access to my kids' accounts and I'm going to read them. If they don't like it, that's unfortunate."
The accused teens face multiple charges, including human trafficking, robbery, procuring, forcible confinement, sexual assault, assault, threats and abduction. One is also charged with administering a noxious substance.
The names of the accused and their victims are all protected under the Youth Criminal Justice Act.
Public Safety Minister Vic Toews said it would be up to Crown lawyers to decide whether to make an application to have the suspects tried as adults.
"I'm not going to make that decision," Toews said. "What we have done is strengthen the law in terms of human trafficking. We came out with a very strong package in that respect."
Police are also withholding many details of their investigation, saying they don't want to compromise the case.
McGetrick said police are urging any other victims to come forward.
"If there is anyone else who's had a similar experience, please call us and we'll work with them."
In 2010, a 14-year-old British Columbia girl was charged for allegedly prostituting herself and pimping out other girls through the online classified site Craigslist.
The case prompted federal and provincial politicians, including Justice Minister Rob Nicholson, to petition Craigslist about the site's online erotic services section and its potential to encourage child exploitation and human trafficking.
Craigslist pulled prostitution-related ads from its Canadian sites the following month.