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.