MEXICO CITY, Dec. 15 (UPI) -- Violence broke out Sunday in the city of Chilpancingo, Guerrero, Mexico as police clashed with protesters organizing a concert for 43 missing university students.
Both sides blamed the other for initiating the altercation, which began after protesters had finished erecting street barricades ahead of the scheduled concert.
Police said eight officers were injured in the melee and protesters reported 13 injuries, including relatives of missing students. The concert was canceled in the wake of the unrest.
The latest outbreak of violence comes amid continued frustration with the government's delayed response to the students' disappearance in Iguala, Guerrero state, in late September. The circumstances of their disappearance revealed complicity between the local government, police and a prominent drug gang.
Also on Sunday, the Mexican magazine Proceso published an investigative report alleging federal police complicity in the disappearance of the 43 students, a version at odds with most accounts of the events.
The findings were reportedly based on leaked federal government documents and a report by the government of Guerrero state. "We have information that proves the federal government knew what was happening in the moment it was happening, and participated in it," Anabel Hernandez, the lead reporter, told Huffington Post.
Pena Nieto, whose approval rating last month was at an all-time low of 39 percent, has faced public pressure to resign.