Thousands of students march in Mexico to protest violence

Thousands of students take part in the march for silence, in protest against groups of institutional thugs that operate on campus at Mexico’s National Autonomous University, UNAM, in Mexico City, Thursday, Sept. 13, 2018. The students are demanding an end to violence by groups of thugs known as “porros” who are often registered but don’t attend classes. (AP Photo/Marco Ugarte)

A student with his mouth taped shut participates in the march of silence, along with thousands of other students in protest against groups of institutional thugs that operate on campus at Mexico’s National Autonomous University, UNAM, in Mexico City, Thursday, Sept. 13, 2018. The students are demanding an end to violence by groups of thugs known as “porros” who are often registered but don’t attend classes. (AP Photo/Marco Ugarte)

Thousands of students march in protest against groups of institutional thugs that operate on campus at Mexico’s National Autonomous University, UNAM, in Mexico City, Thursday, Sept. 13, 2018. The students are demanding an end to violence by groups of thugs known as “porros” who are often registered but don’t attend classes. (AP Photo/Marco Ugarte)

Thousands of students march in protest against groups of institutional thugs that operate on campus at Mexico’s National Autonomous University, UNAM, in Mexico City, Thursday, Sept. 13, 2018. The students are demanding an end to violence by groups of thugs known as “porros” who are often registered but don’t attend classes. (AP Photo/Marco Ugarte)