Mexico's drug wars

As the investigation into the presumed murder of 43 students in Mexico continues, one student who says he escaped the attacks describes how police surrounded the students' buses and began to fire.

Mexico City has largely been spared the drug violence in other parts of the country. But a brazen daylight abduction of 12 young people from a Mexico City bar is putting the spotlight on one of the capital's roughest neighborhoods, and putting the popular mayor on the defensive.