In Mexico, the federal government is facing new questions about its role in the disappearance of 43 students in the state of Guerrero. A report by the Mexican news magazine Proceso has found federal police participated in the attack, which the government has blamed on local police and a drug gang. The report coincided with a crackdown by federal police who reportedly attacked students and families of the disappeared as they organized a concert in Chilpancingo, the capital of Guerrero state. More than 20 people were injured in the clashes Sunday including a journalist with the Associated Press. Pedro López, a colleague of the missing students, said the attack was arbitrary.

Pedro López: “What took place was simply arbitrary compared to other events that have taken place; there wasn’t any disturbance or social demonstration going on, but rather a completely cultural activity in which we were protecting the area, guarding the fencing that had been put in place for the event.”