Seven were killed March 29 when a masked gunman in a bullet-proof vest and black uniform opened fire with an AK-47 in a bar in in the commercial center of Chihuahua City in northern Mexico. Three of the dead were women who worked at the bar, called Mogavi. The city has seen a wave of violence as the Juárez Cartel and Sinaloa Cartel battle for control of the strategic corridor leading to the border town of Ciudad Juárez, immediately up the highway to the north. In a similar incident that night, gunmen opened fire in a bar in Ciudad Altamirano, Guerrero state, killing four civilians and three off-duty federal agents. The previous night, an armed commando raided a nightclub called La Habana in Oaxaca City, in Mexico's south, menacing staff and patrons with AK-47s, shooting up the bar's facade, and abducting one man identified only by his nickname, "El Chiquilín."

At least 13 people, including seven police officers, were killed and eight others wounded in three shootouts involving police and "armed commandos" on the border of Jalisco and Michoacán states in west-central Mexico Dec. 23. The first incident came when Michoacán state police responded to a report of a traffic accident in Briseñas  municipality and were ambushed. Similar gunfights shortly followed in the nearby municipalities of Quitúpan and Ayotlán. The following day, bullets flew in the central plaza of Yurécuaro, Michoacán, in what authorities called a shootout between the Knights Templar and Jalisco Nueva Generación cartel, leaving an unarmed bystander dead. Also on Christmas Eve, a group of armed men stormed the town of El Platanar de Los Ontiveros in the mountains of northwestern Sinaloa state, killing nine with assault weapons and dumping their bodies on a sports field. Authorities called that one a fight between the Sinaloa Cartel and the Zetas. (AP, Dec. 26; AFP, Dec. 25; EFE, Dec. 24; Milenio, Dec. 23)

As Mexico has aggressively militarized its "drug war" over the past years, the nation's capital has been an exception, with authorities reluctant to send soliders to patrol the seat of federal power—until now. Over 1,000 army troops have been mobilized to the streets of Nezahualcóyotl, a suburb of Mexico City, just south of the Federal District line in México state, which has seen a dramatic increase of violence in the past weeks. The México state Prosecutor General says 119 assassinations have been registered so far this year, mostly in Nezahualcóyotl. The decision to send in army troops—under a program dubbed "Operation Neza"—was apparently sparked by the Sept. 16 stabbing death of México state lawmaker Jaime Serrano Cedillo of the Institutional Revolutionary Party (PRI). Although subsequent reports have indicated he was killed by his wife in a domestic dispute, Serrano was the second PRI politician killed in as many days last week. On Sept. 15, Eduardo Castro Luque, newly elected to the Sonora state legislature, was shot full of nine bullets in front of his home in Ciudad Obregón. The twin slayings came when the country was on high alert for Independence Day celebrations, with extra troops deployed to conflicted states to head off terror attacks on the festivities. The PRI, a once-entrenched political machine, returns to power after 12 years in opposition, when president-elect Enrique Peña Nieto takes office in December. (LAT, AP, Sept. 21; WSJ, El País, Spain, Sept. 20; EFE, AP, La Jornada, Sept. 15)

Mexican naval forces in the oil port of Tampico, Tamaulipas, on Sept. 13 arrested Jorge Eduardo Costilla Sánchez AKA "El Coss"—notorious leader of the Gulf Cartel—along with five cohorts, apparently without resistance. Authorities hailed it as a major blow against the cartel, coming just a week after the arrest of another Gulf kingpin, Mario Cárdenas Guillén AKA "El Gordo" (Fatso), captured by Mexican marines in Altamira, also in Tamaulipas—the brother of Osiel Cárdenas Guillen, who led the cartel until he was detained in 2003.