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University students demonstrate against the recent attacks of infiltrated groups in a student´s march on September 3, in Mexico City, on September 13, 2018. (Photo by RODRIGO ARANGUA / AFP) (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)

University students demonstrate against the recent attacks of infiltrated groups in a student´s march on September 3, in Mexico City, on September 13, 2018. (Photo by RODRIGO ARANGUA / AFP)        (Photo credit should read RODRIGO ARANGUA/AFP/Getty Images)

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MEXICO CITY, MEXICO - NOVEMBER 16: UNAM students shout slogans during a protest around the university campus demanding respect for the autonomy of the institution on November 16, 2014 in Mexico City, Mexico. Yesterday, the judicial police entered the university premises and in an unexplained incident, fired at some students injuring the leg of one of them. Hundreds of riot police arrived at the college where minor clashes were reported. (Photo by Miguel Tovar/LatinContent via Getty Images)

MEXICO CITY, MEXICO - NOVEMBER 16:   UNAM students shout slogans during a protest around the university campus demanding respect for the autonomy of the institution on November 16, 2014 in Mexico City, Mexico. Yesterday, the judicial police entered the university premises and in an unexplained incident, fired at some students injuring the leg of one of them. Hundreds of riot police arrived at the college where minor clashes were reported. (Photo by Miguel Tovar/LatinContent via Getty Images)

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MEXICO CITY, MEXICO - NOVEMBER 16: UNAM students march during a demonstration against Mexico's government who suggests that 43 missing students were murdered and their charred remains tipped in a rubbish dump and a river in Guerrero, Mexico, on November 16, 2014 in Mexico City, Mexico. (Photo by Miguel Tovar/LatinContent via Getty Images)

MEXICO CITY, MEXICO - NOVEMBER 16:  UNAM students march during a demonstration against Mexico's government who suggests that 43 missing students were murdered and their charred remains tipped in a rubbish dump and a river in Guerrero, Mexico, on November 16, 2014 in Mexico City, Mexico. (Photo by Miguel Tovar/LatinContent via Getty Images)

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MEXICO CITY, MEXICO - NOVEMBER 16: UNAM students march next to a barricade during a protest around the university campus demanding respect for the autonomy of the institution on November 16, 2014 in Mexico City, Mexico. Yesterday, the judicial police entered the university premises and in an unexplained incident, fired at some students injuring the leg of one of them. Hundreds of riot police arrived at the college where minor clashes were reported. (Photo by Miguel Tovar/LatinContent via Getty Images)

MEXICO CITY, MEXICO - NOVEMBER 16:   UNAM students march next to a barricade during a protest around the university campus demanding respect for the autonomy of the institution on November 16, 2014 in Mexico City, Mexico. Yesterday, the judicial police entered the university premises and in an unexplained incident, fired at some students injuring the leg of one of them. Hundreds of riot police arrived at the college where minor clashes were reported. (Photo by Miguel Tovar/LatinContent via Getty Images)

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MEXICO CITY, MEXICO - NOVEMBER 16: UNAM students shout slogans during a protest around the university campus demanding respect for the autonomy of the institution on November 16, 2014 in Mexico City, Mexico. Yesterday, the judicial police entered the university premises and in an unexplained incident, fired at some students injuring the leg of one of them. Hundreds of riot police arrived at the college where minor clashes were reported. (Photo by Miguel Tovar/LatinContent via Getty Images)

MEXICO CITY, MEXICO - NOVEMBER 16:   UNAM students shout slogans during a protest around the university campus demanding respect for the autonomy of the institution on November 16, 2014 in Mexico City, Mexico. Yesterday, the judicial police entered the university premises and in an unexplained incident, fired at some students injuring the leg of one of them. Hundreds of riot police arrived at the college where minor clashes were reported. (Photo by Miguel Tovar/LatinContent via Getty Images)