Eleven years after her son vanished, Delfina de la Cruz vented frustration at the unsolved disappearances of 43 Mexican students who were allegedly kidnapped by drug traffickers while authorities turned a blind eye.

The students from the Ayotzinapa teacher training college -- whose members have a history of political activism -- had commandeered buses to travel to a demonstration in Mexico City when they went missing on September 26, 2014.

The case is considered one of the worst human rights atrocities in Mexico, where a spiral of drug-related violence has left more than 120,000 people unaccounted for.

In the rain, de la Cruz and the mothers of other victims led a massive protest march in Mexico City on Friday to mark the anniversary.

"We are back where we started," she said. "I want t

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