On Sept. 26—one year anniversary of the disappearance of 43 students in Mexico's southern state of Guerrero—thousands of protesters filled the streets of Mexico City. The march, led by parents of the missing students, made its way from Los Pinos, the presidential residence, to the Zócalo, the capital's massive central square. Protests were also held in Iguala, Guerrero, where the 43 students from a teachers' college in nearby Ayotzinapa were abducted one year ago. Many carried mass-produced placards that read "Ni un desaparecido más, Ni un muerto más—¡¡Fuera Peña Nieto!!"—"Not one more disappearance, not one more death—Out with Peña Nieto!!" The administration of President Enrique Peña Nieto is under growing pressure in the case. There have now been 110 arrests of members of the Guerreros Unidos narco-gang, named by the government as responsible in the mass abduction. But there have been no convictions. The government says the students were massacred by the drug gang, and claims two sets of remains have been identified. But survivors, activists and rights observers say the official story doesn't hold water.