MEXICO CITY—Investigators have found a bone fragment belonging to one of the 43 student teachers who disappeared in Mexico in 2014, the Attorney General’s office said on Tuesday, only the second set of remains to be definitively identified in a case that has roiled the country.
The abduction and apparent massacre of 43 students from the Ayotzinapa Rural Teachers’ College in September 2014 battered Mexico’s reputation and became a symbol of the country’s failure to tackle chronic gang violence and corruption.





