Luis Cardenas, chief of regional security division of the federal police of Mexico, points to surveillance camera footage at the international airport related to a shooting, during a press conference ... more 
Luis Cardenas, chief of regional security division of the federal police of Mexico, points to surveillance camera footage at the international airport related to a shooting, during a press conference in Mexico City, Thursday, June 28, 2012. Two federal police officers suspected of working for drug traffickers opened fire on fellow officers in a crowded food court Monday, June 25, 2012, killing three policemen. The officers remain at large. (AP Photo/Esteban Felix) less 
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Associated Press | Photo By Esteban Felix
Fri, Jun 29, 2012 11:07 AM EDT