When soldiers tried to halt a suspicious-looking SUV that was being escorted through Monterrey by a state policeman, the officer radioed for backup. In minutes, police from 40 patrol cars surrounded the troops, drawing their guns and sending the soldiers diving for cover in an hour-long standoff.Confrontations like that are happening with increasing frequency in Mexico's wealthiest city as soldiers fight corrupt police officers helping drug cartels â in addition to taking on the drug dealers themselves.

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