Last month, two CIA agents were killed in a car crash along with local Mexican investigators on their return from an anti-narcotics operation in the northern state of Chihuahua

May 12 (Reuters) - Credit ratings agency S&P on Tuesday revised Mexico's outlook to "negative" from "stable", citing the risk of very slow fiscal consolidation largely due to weak economic growth that could lead to a faster-than-expected buildup in government debt and a higher interest burden.