Melissa del Pozo and Daniel Hernandez
Despite the damning report by an independent panel, a government official defended the original investigation this week. President Enrique Peña Nieto said he would meet parents of the missing as the one-year mark approaches.
The footage is meant to silence theories on a larger cover-up for Guzman's escape. It shows the inmate pacing, putting on shoes, ducking in his shower, and disappearing.
Joaquin "El Chapo" Guzman, who became a top boss of the powerful Sinaloa cartel after a previous escape from a Mexican prison in 2001, is on the loose once again.
Mexican officials delivered a report to the UN committee on forced disappearances in Geneva this week, acknowledging the Ayotzinapa case as a sign that much more must still be done to prevent similar tragedies.
At least 2 people were killed when an LP gas truck exploded outside a maternity and children's hospital in western Mexico City.
Federal officers attempted to prevent the Ayotzinapa students from setting up for a solidarity concert on Sunday, sparking clashes that left 22 people injured, including two parents of the missing.
Forensics experts have identified one of the missing Mexican students among incinerated remains found in a remote dump in Cocula, Guerrero.