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Police officers investigate the scene of a car bomb attack on a main avenue in downtown Ciudad Juarez, in northern Mexico, on July 16, 2010. An armed commando set off a car bomb against three police patrol vehicles circultating along September 16th Avenue in the border town, killing two police officers and wounding 12 others. Another grenade exploded when paramedics and journalists arrived, leaving three medical assistants seriously injured a cameraman with minor injuries. AFP PHOTO/Jesus Alcazar (Photo credit should read Jesus Alcazar/AFP/Getty Images)

Police officers investigate the scene of a car bomb attack on a main avenue in downtown Ciudad Juarez, in northern Mexico, on July 16, 2010. An armed commando set off a car bomb against three police patrol vehicles circultating along September 16th Avenue in the border town, killing two police officers and wounding 12 others. Another grenade exploded when paramedics and journalists arrived, leaving three medical assistants seriously injured a cameraman with minor injuries. AFP PHOTO/Jesus Alcazar (Photo credit should read Jesus Alcazar/AFP/Getty Images)