Demonstrators hold a protest to mark nine years since the student’s disappearance from Ayotzinapa Teacher Training College.

Earlier this year, an international panel of experts looking into the case criticized active investigations, saying it had received incomplete information and that the Defense Ministry hid documents about who was involved.

It also said security forces were complicit in abducting the 43, and that Army, Navy, police and intelligence agencies knew, minute by minute, where the students were.

Aljazeera/Agencies.