What has Happened to Mexico's Missing Students?

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Mexico is in uproar about the fate of 43 students from a rural teachers’ college who disappeared last month. A mass grave found last week contained dozens of bodies thought to be those of the students. There have been protests throughout this week in cities across Mexico demanding justice and accusing police of conspiring with local criminal gangs. We talk to a survivor of the attack, and we hear from students in Mexico and abroad, from the BBC’s correspondent in Mexico who has been to the site of the mass grave in the southern state of Guerrero, and from others. Why are so many in Mexico afraid for their own safety? Who do people blame for the students’ disappearance? And what does this incident tell us about wider social and political problems in Mexico?