On the night of May 14-15, 25 to 30 Guatemalan laborers were murdered on the farm of a regional landowner near the village of San Benito, Peten department, Guatemala's northernmost province. The mass killing appears to be the work of Mexico's Los Zetas cartel, which is known to have a presence in the region and to control the two Mexican states that border Guatemala to the north and west, Campeche and Chiapas . There was also a scattered display of beheaded and dismembered victims, a Los Zetas trademark. Somewhat out of character was a message on a wall of a building written in blood, with a victim's leg as the writing implement, saying the owner of the land where the bodies were found would be next. The message was signed "Z-200," which would appear to be a Zeta radio call sign. Such "narcomantas" are not commonly left by Los Zetas.