From the Indigenous Policy Web site

Last fall, while Zapatistas' Subcommander Marcos was engaged in a national tour of Mexico in a bid to unite the various social struggles in a national reform movement, an attack took place upon the jungle settlement of Viejo Velasco, in the Lacandon Selva rainforest area of Chiapas, the Zapatistas’ main stronghold, that killed an estimated four people, with three others missing, and inflicting at least one rape, on November 13. There has been some question as to who the attackers were. Some claim that they were Hach Winik people - the indigenous inhabitants of the Selva, popularly known as the Lacandon Maya, and it has been reported that perhaps 300 Hach Winik people have fled their homes in the area, fearing Zapatista reprisals. Most reports have indicated that the attackers, like the victims, were Tzeltals and Chols, from Nueva Palestina, - whose lands, like those of the Hach Winik, but unlike large numbers of other Indigenous people, have been legally titled by the government and who have therefore perceived the rebel Zapatistas as a threat. Thus, a strong rivalry between land titled and non-land titled Maya groups in the Selva is coming to the fore, perhaps as a government strategy to undermine the Zapatistas. A Nov. 14 bulletin from the Fray Bartoleme de las Casas Human Rights Center (Frayba), the Chiapas rights watchdog group founded by the local Catholic diocese, blamed the attack on presumed comuneros from Palestina, calling the incident a ''premeditated attack'' which may signal a resurgence of army-backed paramilitary violence as a ''counterinsurgency strategy against the EZLN.'' The bulletin stated that Viejo Velasco residents have identified the group behind the attack as the deceptively-dubbed Organization for the Defense of Indigenous and Campesino Rights (OPDDIC) - apparently the same groups known as the Indigenous Revolutionary Anti-Zapatista Movement, which attacked Zapatista communities in the region in the late '90s. If the Viejo Velasco assault is the beginning of a new campaign of violence against the Zapatistas, the Zapatista National Liberation Army, which has refrained from resorting to arms since the Jan. 12, 1994 cease-fire that opened the way for a dialogue with the government,  will be faced with major challenges. Ten days after the attack, the OPDDIC issued a letter demanding the EZLN dismantle its system of rebel government in the Lacandon Selva, saying, ''We demand the immediate dis-occupation of the lands that have been occupied by the EZLN support bases, located in the municipalities of Altamirano, Ocosingo, Chilon, Tumbala and Sitala; if this is not done, the ejiditarios [collective farmers] will take the necessary measures to re-occupy their lands to which they have legal right.''

from the Indigenous Policy Web site
http://www.indigenouspolicy.org/xviii-1/xviii-1-developments.htm#intl