2 Mexican Cops Charged in Killing of 2 Students Prosecutors in southern Mexico say two state police officers have been charged in the killings of two student demonstrators during a protest last month. Guerrero state prosecutors say the shots that killed the two students were fired from where the officers were standing. A statement Thursday says the officers tried to hide evidence, including the clothes they were wearing that day. Students from a rural teachers college blocked a main highway on Dec. 12 to demand more government funds for the school and battled police trying to clear it.