A sudden burst of gunfire echoed off the modest homes clinging to the steep hills of the 20 de Julio neighborhood, one of Medellín`s most violent. This is the newest front of Colombia`s brutal, 38-year-old civil war. Leftist rebels and rightist paramilitary fighters have transformed Medellín`s lawless, impoverished neighborhoods into a battleground as they wage a daily fight for control of the country`s second largest city. Full Story