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Security forces investigating the role of municipal police in clashes in this southern city a week ago found a mass grave on the edge of town, raising fears the pits might hold 43 students missing since the violence that also resulted in six shooting deaths.

Guerrero Gov. Angel Aguirre said the victims had been “savagely slaughtered.”

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Jesus Lopez, the father of one of the missing students, told The Associated Press that a delegation of family and school representatives would come to Iguala on Sunday to get information about developments in the case from authorities.

“We cannot say anything. We are very nervous, but until they inform us, there is nothing,” said Lopez, whose 19-year-old son, Giovani, hasn’t been seen since the violence last weekend.

Separately, a group of students and relatives of the missing young people said they planned to march Sunday from Aytozinapa Normal school to the state capital of Chilpancingo to demand information in the case.