Military complicity grows in case of Mexico's 43 missing students

International panel of experts finds evidence of military collusion with drug traffickers in the students' 2014 abduction.
Investigators accuse the armed forces of manipulating information, withholding documents, and obstructing justice.
Only 3 of the 43 students' remains have been identified, and no one convicted over 8 years after their disappearance.
Photos show dead bodies bound in ways similar to those detained by marines, raising questions about military involvement.
President López Obrador pledged truth and justice but has protected the military over pursuing accountability.