More than 18 months after 43 aspiring young teachers were abducted, Mexicans have no answers as to their fate. For many, the case is a litmus test for the country's commitment to justice.
The Mexican government had touted the effectiveness of its security initiatives. But homicides have climbed since January, with a particularly sharp spike in Mexico City.
Egypt said the group was traveling without formal authorization in the western desert near Libya, where security forces are battling Islamic militant groups.
Joaquin Guzman was arrested last year, boosting the anti-drugs credentials of President Enrique Peña Nieto. His escape is a blow to the president and a potential boon for the kingpin's narcotics cartel.