Luis Abarca, and his wife, Maria de los Angeles Pineda, in connection with the mass disappearance. Prosecutors accuse Abarca and his wife of masterminding the alleged kidnapping. The two were arrested in 2014.

Seventy of those arrested are police officers and alleged cartel members. Many of them have claimed they were tortured by officials, the AP reported.

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The students from a teaching college in Ayotzinapa, more than 150 miles away from Iguala, were last seen alive Sept. 26, 2014, when they were crammed into police cars. They traveled to Iguala that day to protest education reforms. At some point they hijacked a bus and were stopped by police officers who opened fire at them. They have not been seen or heard from since.

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An earlier theory on the students' disappearance wasthat Iguala police handed them over to drug cartel assassins, who shot them and burned their bodies outside the nearby town of Cocula, The Washington Post's Joshua Partlow reported last year.

But independent investigators who've reviewed evidence in the case have disputed the theory that the students bodies were burned and claimed that Mexican authorities tortured witnesses and mishandled evidence.

The outside experts, convened by the Inter-American Commission on Human Rights, prepared a 400-page report questioning claims by Mexican authorities on how the crime unfolded, Partlow wrote. Their investigation, which included interviews with prisoners, witnesses and government officials, found that victims' clothes found by authorities had not been examined and surveillance videos were erased.

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The report, which came out nearly a year after the students vanished, also point to signs that