I don't necessarily think this was gang related. Unfortunately, this could all be planned out by searching the internet.
When I was a kid, as well as all the other kids out there who were somewhat enticed by prostitution -we basically had 3 choices when it came to satisfying our curiousity

we would either look through the yellow page ads, look at the newspaper classified ads, or check out the actual stroll ( on Dalhousie/Murray back in the day) Chances of a kid making their way to the market for that reason ..lol...were pretty slim, so it usually was skimming through the ads...and those really did not provide all that much detail, usually a name and a phone number.
Today, kids can go to advertising sites & see very discriptive text regarding services provided, pics showing what the sp looks like, and what she charges...they also have access to sites such as these-where descriptive details are given regarding sexual acts, what is prefered, and what is not...even videos on you tube-with all this easy access to this type of information, this could have easily been pulled off by a couple of teenagers with a little time on thier hands
Unfortunately there are are many
little sociopaths in the making out there...