Investigators have found a bone fragment belonging to one of 43 students who disappeared in
Mexico in September 2014, prosecutors said on Tuesday, only the second set of remains to be definitively identified in a case that roiled the country.
The abduction and apparent massacre of 43 student teachers from the Ayotzinapa Rural Teachers' College became a symbol of Mexico's chronic failure to tackle gang violence and corruption.
When President Andres Manuel Lopez Obrador took office 19 months ago, he pledged to shed light on the crime after the last government's conclusions about the case were widely criticized.