On June 26, the small Mexican town of Apaseo el Alto, in Guanajuato state, was the scene of a deadly firefight between members of Los Zetas and federal and local security forces. The engagement began when a joint patrol of Mexican soldiers and police officers responded to a report of heavily armed men at a suspected drug safe house. When the patrol arrived, a 20-minute firefight erupted between the security forces and gunmen in the house as well as several suspects in two vehicles who threw fragmentation grenades as they tried to escape.
When the shooting ended, 12 gunmen lay dead, 12 had been taken into custody and several soldiers and police officers had been wounded. At least half of the detained suspects admitted to being members of Los Zetas, a highly trained Mexican cartel group known for its use of military weapons and tactics.
When authorities examined the safe house they discovered a mass grave that contained the remains of an undetermined number of people (perhaps 14 or 15) who are believed to have been executed and then burned beyond recognition by Los Zetas. The house also contained a large cache of weapons, including assault rifles and fragmentation grenades. Such military ordnance is frequently used by Los Zetas and the enforcers who work for their rival cartels.
STRATFOR has been closely following the cartel violence in Mexico for several years now, and the events that transpired in Apaseo el Alto are by no means unique. It is not uncommon for the Mexican authorities to engage in large firefights with cartel groups, encounter mass graves or recover large caches of arms. However, the recovery of the weapons in Apaseo el Alto does provide an opportunity to once again focus on the dynamics of Mexico’s arms trade.--------------------------
The section above is just the main lead-in into yet another very informative article from Stratfor.
The full article linked above is recommended if you are interested in Mexico and arm trafficking in general.
Here is an interesting block that gives you a better understanding on some of those numbers we have heard about...
According to the report, some 30,000 firearms were seized from criminals by Mexican officials in 2008. Out of these 30,000 firearms, information pertaining to 7,200 of them, (24 percent) was submitted to the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) for tracing. Of these 7,200 guns, only about 4,000 could be traced by the ATF, and of these 4,000, some 3,480 (87 percent) were shown to have come from the United States.
This means that the 87 percent figure comes from the number of weapons submitted by the Mexican government to the ATF that could be successfully traced and not from the total number of weapons seized by the Mexicans or even from the total number of weapons submitted to the ATF for tracing. The 3,480 guns positively traced to the United States equals less than 12 percent of the total arms seized in 2008 and less than 48 percent of all those submitted by the Mexican government to the ATF for tracing.
In a response to the GAO report, the U.S. Department of Homeland Security (DHS) wrote a letter to the GAO (published as an appendix to the report) calling the GAO’s use of the 87 percent statistic “misleading.” The DHS further noted, “Numerous problems with the data collection and sample population render this assertion as unreliable.”