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Protesters in the state capital of Guerrero, Mexico held a massive rally on Wednesday and shut down highways demanding answers amid the discovery of a mass grave in Iguala and the disappearance of 43 teachers and students from a rural teachers college. According to authorities, local security officials are suspected of conspiring with gang members to kill the students.

In Washington, D.C., the Mexican Ambassador met with Hispanic journalists on Wednesday and outlined the government's steps in the investigation. Ambassador Eduardo Medina Mora stated the government "categorically condemns these deplorable acts" and said federal police and the Army have assumed responsibility of Iguala's public security.

Authorities have not identified the 28 bodies found in the mass grave over the weekend nor have they linked linked it to the students who disappeared after two attacks allegedly involving police in which six people were killed and at least 25 wounded. The state has arrested 22 Iguala police officers, who have been replaced temporarily by a special federal police unit. Iguala's mayor is being considered a fugitive.

A woman holds a photograph of a missing student during a march in support of the Ayotzinapa Teacher Training College missing students, in Monterrey October 8, 2014. Thousands marched through Mexico City and other Mexican cities on Wednesday to demand the government find out what happened to dozens of missing students, who are feared to have been massacred by gang members and police in Iguala, state of Guerrero. The students from a teachers' college went missing after they clashed with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26. A mass grave was found near the town over the weekend, full of charred human remains.DANIEL BECERRIL / Reuters