** FILE ** Mexican federal police guard a U.S. Embassy vehicle after it came under fire from unknown gunmen on Highway 57 between Mexico City and Monterrey, near the town of Santa Maria Del Rio in San Luis Potosi state, Mexico, on Tuesday, Feb. 15, 2011. A U.S. Immigration and Customs Enforcement agent was killed, and another was wounded in the attack. (AP Photo/Pulso Diario de San Luis, Teodoro Blanco Vazquez)
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