On May 19, the Mexican army announced the arrest of eight suspects in the massacre of 49 people who were decapitated, mutilated and left in plastic bags on the side of a highway in Cadereyta, Nuevo León, just outside Monterrey last week. Among those arrested was suspected ringleader Daniel Elizondo, AKA "El Loco"—said to be a member of the Gulf Cartel. Drugs, guns and hand grenades were seized during the arrests. However, authorities earlier said that the graffito "100% Zeta" found near the bodies indicated that Los Zetas, the Gulf Cartel's bitter rivals, were responsible. At the time of the massacre, local authorities resorted to the now common tactic of playing down its significance. "This continues to be violence between criminal groups," said Jorge Domene, Nuevo Leon's state security spokesman. "This is not an attack against the civilian population." Yet authorities admitted the victims had not been identified, and may have been migrants attempting to cross into the United States. (AlJazeera, May 20; AP, May 19; AP, May 15; CNN, May 14)

Groups in Argentina, Brazil, France, England, New Zealand, Scotland, South Africa, Spain, Switzerland and the US are planning events in the May 15-22 "Week of Global Struggle for the Liberation of Alberto Patishtán Gómez and Francisco Sántiz López," two indigenous prisoners from the southeastern Mexican state of Chiapas. The week of actions was initiated by the New York-based Movement for Justice in El Barrio.

Left-leaning independent unions dominated celebrations of International Workers Day in Mexico on May 1, while some centrist labor federations decided not to hold marches, reportedly because of concern over security. Tens of thousands of unionists, campesinos and other activists participated in the independent unions' annual march to Mexico City's main plaza, the Zócalo; the left-leaning daily La Jornada reported that more unions and more unionists took part than in previous years.

In what the Mexican media are calling "Black Friday," nine bodies—some bearing signs of torture—were hanged side-by-side from an overpass in the border city of Nuevo Laredo, Tamaulipas, on May 4, while 14 decapitated bodies were found stuffed in a minivan left outside a customs inspection building. The heads were later found in three ice coolers left outside the city hall. Four of those left hanging from the overpass were women; the decapitated bodies were all of men in the their 20s. A professionally printed "narco-banner" in block letters on the overpass read: "This is how I am going to finish off [Asi me los voy a ir acabando] all the jerks* [todos los pendejos] you send to heat up [que mandes a calentar] the plaza," apparently a reference to a car bomb that exploded in the city center on April 24, targeting the police and injuring one. The banner included a warning for someone called "El Gringo" who it accused of car-bomb attacks. It closes: "Now we'll see you around, you bunch of whorish parasites." (Ahora ahí nos vemos bola de parapatras puto.) Authorities said the message appeared to be from Los Zetas and addressed to their local rivals in the Gulf Cartel. Mexico's federal government has launched an operation dubbed "Northeast Coordinator" in response to the inter-factional violence in Tamaulipas.

The Mexican Chamber of Deputies on April 30 approved a bill that will recognize, protect and provide aid to victims of crimes stemming from the gang-related drug wars that have engulfed the country for nearly the last six years. Known as the General Victims Act, the law was passed by Mexico's lower house of Congress as a means to compensate those persons adversely affected by fighting between gangs and security forces. The law will provide financial, legal and medical aid to those in need; victims of criminal violence will be eligible for relief of up to 950,000 pesos ($73,000). The bill was passed by the Mexican Senate last week in response to longstanding demand, as more than 47,500 people have died in Mexico over the last five-and-a-half years due to drug-related violence, and thousands more have gone missing.

Wal-Mart de México's stocks fell by a total of 15.46% on the Bolsa Mexicana de Valores (BMV, the Mexico City stock market) from April 23 through April 24 following a report in the New York Times that the company's US-based owner, Wal-Mart Stores, Inc., had covered up a major bribery scandal in 2005. The Mexican branch of the giant retailer is the largest private employer in the country, with 2,138 outlets: 1,250 stores under the Aurrerá name, 214 Wal-Mart stores, 127 Sam's Clubs, 88 Superamas, 94 Suburbias and 365 restaurants. (La Jornada, Mexico, April 24: LJ, April 25)

An unknown assailant killed retired Mexican general Mario Arturo Acosta Chaparro Escapite with three shots to the head on the evening of April 20 at an auto shop in the Anáhuac section of Mexico City; the general had just brought his car there for repairs. The killer and an accomplice escaped on a motorcycle. This was the second attack against the general in two years; he was shot in the abdomen in Mexico City on May 18, 2010, in a supposed robbery attempt.

Eight indigenous Purépecha were shot dead the morning of April 18 near the autonomous community of Cherán in the western Mexican state of Michoacán. Two of the victims were from Cherán, which has been engaged in a year-long struggle to protect local forests from illegal loggers; six of the people killed were from the town of Casimiro Leco, better known as El Cerecito, where many of the loggers live.