At least 21 people, including a 12-year-old girl and other ordinary citizens, have been killed by warring drug gangs since Thursday in the western state of Sinaloa, in one of the worst spasms of violence in memory in a region long conditioned to narcotics-related savagery. The wave of deadly mayhem began with the audacious daytime shooting of a dozen people in the capital, Culiacan, and continued during the weekend and into Monday. Full Story