In the stark, rolling hills that join Tijuana to the coastal port town of Rosarito, a battle is raging. A 15-year-old boy reloads his weapon behind the rusted hulk of an abandoned pick up truck. He signals his nearby comrade with gloved fingers, raises his head for one last look and then sprints ten long meters to a section of corrugated water pipe. His heart races as he pumps round after round down range at a man twice his age wearing paramilitary battle webbing and camouflaged fatigues.
You can watch the video at ABC News here: