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.

Mexico's Prosecutor General Arely Gómez González announced Sept. 16 that forensic experts have identified the remains of a second victim in the case of the 43 missing students. Human remains found in plastic bags dredged from the Río San Juan in Guerrero state are said to be those of missing student Jhosivani Guerrero de la Cruz. The identification was made by Austrian forensic experts from Innsbruck Medical University, who had earlier identified one other student based on a bone fragment. But the announcement came amid new controversy, as an Argentine forensic team working on the case called the identification of the second set of remains "weak and not definitive." The Argentine Forensic Anthropology Team (EAAF) made the announcement after meeting with the parents of Jhosivani Guerrero two days after the Prosecutor General's announcement.

The Mexican interior ministry, known as Gobernación, was on Sept. 15 accused by a senate committee of covering up evidence pointing to official complicity in the July escape of drug kingpin Joaquin Guzmán Loera AKA "El Chapo"—for more than 10 years the country's most-wanted fugitive. Sen. Alejandro Encinas of the left-opposition PRD, who heads the Senate National Security Committee, said that Gobernación had denied him access to video footage from Guzmán's cell—which is now revealed to incude "drilling sounds" in the background, incdicating that prison authorities ignored construction work on the tunnel through which Chapo escaped. "The video exists and it is crucial in order to identify the extent of complicity in Chapo’s escape," Encinas told the EFE news agency. "Just the fact that the sound of a drill can be heard [on the recording] implies complicity on several levels."

A group of experts appointed by the Inter-American Commission on Human Rights (IACHR) has just issued a new report on the Mexican government's own investigation of the disappearance of 43 students in Guerrero state nearly one year ago—and finds that the official conclusions are improbable. The Sept. 5 presentation of the IACHR findings drew such a huge audeince that organizers had to set up a TV screen for the overflow crowd on the patio of the Mexico City Human Rights Commission offices. Back in January, Mexico's then-Prosecutor General Jesús Murillo Karam announced the results of his investigation: all the students had been killed by members of a narco-gang called the Guerreros Unidos, who incinerated the bodies in a trash dump at the bottom of a canyon, then shoveled what remained into plastic bags and threw them in a river. That theory was largely based on confessions from detainees—who have since claimed to have "confessed" under torture. IACHR investigators who visited the dump site concluded that the incineration of that many bodies would have required an inordinate amount of fuel, and caused a massive forest fire.

Without fanfare in either country, some 3,000 US troops are now arriving in Peru for an anti-drug "training mission." The troops embarked, along with several cargo planes, on the USS George Washington Sept. 1—sparking street protests in Lima. Thousands filled downtown Lima chanting slogans against the "Yankee terrorists," and several US flags were burned. Ex-congressman Gustavo Espinoza decried what he called a "military invasion." He suggested that the US had ulterior motives behind the mobilization: "What is looming is a sort of 'sting operation'...designed to enhance the North American presence not only in Peru but in the Americas... The Empire seeks to change the correlation of forces now in place in the region." (HispanTV, Sept. 2; TeleSUR, Sept. 1)

The constitutional chamber of El Salvador's Supreme Court of Justice on Aug. 24 ruled that the country's notoriously violent street gangs and those who support them financially will now be classified as "terrorist groups." The ruling came in a decision rejecting four challenges to the constitutionality of the country's Special Law Against Terrorist Acts (LECAT). The ruling defines terrorism as the "organized and systematic exercise of violence," placing the label on any group that attempts to usurp the state's monopoly on use of force. The ruling upholds the freezing of funds for any persons believed linked to the named groups, and a ban on any negotiation with the groups. At issue are the rival Mara Salvatrucha and Barrio 18 gangs.

Venezuelan President Nicolas Maduro on Aug. 21 indefinitely closed a busy border crossing with Colombia and declared a 60-day state of emergency in several nearby towns after three soldiers were shot and wounded in an apparent clash with smugglers. Authorities said two assailants on a motorcycle fired on a patrol in the border town of San Antonio del Táchira, wounding a civilian as well as the two army lieutenants and a captain. Maduro has mobilized some 15,000 troops the area, and says the Simon Bolívar International Bridge, over the Río Táchira that forms the border, will remain closed until the assailants are apprehended. Colombian President Juan Manuel Santos has protested the border closure, signaling another flare-up between the uneasy South American neighbors.

Guatemalan President Otto Pérez Molina sent a letter to both the country's congress and reporters early Aug. 3 announcing his resignation and his intention to "stand before justice." The congress had called an emergency session to meet that day to accept the letter of resignation. Several hours before resigning, the public prosecutor requested Pérez Molina's arrest on corruption charges and a trial judge ordered his arrest. Pérez Molina and 30 other government officials allegedly took millions of dollars in bribes in exchange for keeping low import duties. Vice President Alejandro Maldonado has assumed the presidency, and must compile a list of three names for consideration for vice president, to be chosen by congress. Maldonado replaced vice president Roxana Baldetti, who was arrested in August on corruption charges. Eight other government officials have already resigned over the allegations. Pérez Molina's resignation comes only three days before the Guatemalan general election.