Detective Ramon Jasso was heading to work in this bustling city a few days ago when an SUV pulled alongside and slowed ominously. Within seconds, gunmen fired 97 bullets at the 37-year-old policeman, killing him instantly.
Mr. Jasso had been warned. The day before, someone called his cellphone and said he would be killed if he didn't immediately release a young man who had been arrested for organizing a violent protest in support of the city's drug gangs. The demonstrators were demanding that the Mexican army withdraw from the drug war. The protests have since spread from Monterrey -- once a model of order and industry -- to five other cities. . .