Mexican Prosecutor Who Helped C.I.A. Secretly Operate in His State Flees to the U.S.

The prosecutor, who faces arrest in Mexico after allowing C.I.A. officers into Chihuahua state, is under the protection of the U.S. government, according to U.S. and Mexican officials.Mexican soldiers on patrol in Ciudad Juárez in Chihuahua state, Mexico, in May.