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Angry, desperate parents on Monday demanded the safe return of 43 missing university students, even as officials indicated that at least some were probably killed and dumped in mass graves.

Twenty-eight bodies were recovered from a string of hidden pits over the weekend outside the city of Iguala in Mexico’s Guerrero state, and authorities were working to identify them through DNA and other tests.

The students, all of them freshmen, went missing Sept. 26 after they were attacked by Iguala police. They constituted about one-third of their school’s first-year class.

Many of the parents, who gathered at the university, refused to accept that their children were dead, and they blamed their disappearances on the state government.

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