Here is an excerpt from Alicia A. Caldwell's Associated Press article in The Washington Post:
"The mayor of a violent Mexican border city said Monday he fears a shooting that killed 16 people in a working class neighborhood may have been random because many of the victims were 'good kids' with no apparent ties to drug gangs. The dead included at least eight teenagers, the youngest a 13-year-old girl. Mayor Jose Reyes Ferriz said police were pursuing all lines of investigation. But he said none of the victims of the attack Saturday night had criminal records, and the teenagers were 'good kids, students, athletes... 'There is no logical explanation, a concrete reason for this event. This is something that worries us, gratuitous or random criminal acts,' Reyes told MVS Radio. 'It goes way beyond what had been happening and puts Ciudad Juarez in even greater danger.'" Link to Full Article
Analysis: Until the results of the investigation start coming out, it's almost impossible to say whether or not these kids were or weren't involved with organized crime. This truly is a sad, no-win situation either way. If the kids weren't involved in the drug trade, then someone decided it would be a good idea to just randomly shoot and kill a bunch of people in Juárez. That would be a significant development because it's a clear sign that DTO tactics are degenerating further, and delving into terrorist tactics.
If any of the kids were involved in the drug trade, then it becomes a sad reflection of the state of things in Juárez - the age of perpetrators and victims becoming lower and lower, and opportunities for Mexico's youth in such places declining. The allure of the DTO lifestyle to many teenagers in Mexico can't be denied, and is just one of the many aspects of the drug war the Mexican government has to figure out how to combat.
In this case - if any of those kids were involved with organized crime - sending in the Mexican army isn't going to cut it. This is a profound sociological issue that can only be dealt with at a cultural - i.e. a familial - level.