CARACAS, Venezuela (AP) -- Venezuelan authorities launched an investigation on Monday into the shooting death of an Indian chief who had repeatedly requested protection from the government as he campaigned for indigenous rights in a largely lawless and increasingly violent region.
Information Minister Ernesto Villegas said Sabino Romero, a leader of the Yukpa tribe, was fatally shot on Sunday along a highway in the western state of Zulia.
Villegas said investigators suspect Romero may have been the victim of a hired killing, but authorities have not determined a motive.
"The investigation is under way," Villegas said. "We cannot put forth any type of hypothesis regarding this reprehensible act."
The Prosecutor General's Office issued a statement saying that Romero reportedly was gunned down by two assailants riding a motorcycle. The gunmen stopped a vehicle carrying Romero and sprayed it with bullets, according to prosecutors.
The indigenous leader's wife, Luisa Martinez de Romero, was wounded.
No suspects have been arrested.
Justice Minister Nestor Reverol told state television that federal police traveled from Caracas to Zulia to assist state authorities investigating Romero's murder.
Reverol suggested that owners of large swaths of land located along the Perija mountain range may be responsible for Romero's murder.
In a message posted on the Twitter social networking site, Zulia state governor Francisco Arias, a close ally of President Hugo Chavez, announced that federal and state officials would also join forces "to advance on the distribution of land for the Yukpas."
Romero had long campaigned for the rights of the Yukpa and the demarcation of their lands in the Perija mountain range bordering neighboring Colombia.
Foro por la Vida, a group of Venezuela's most prominent human rights organizations, in a statement strongly condemned the killing, calling for "exhaustive, transparent and quick investigation" to determine who was responsible.
In a statement of its own, Foro por la Vida noted that tensions between the Yukpa and cattle ranchers have increased in recent years, occasionally leading to violence, as the Indians have settled on lands claimed by ranchers and demanded the government initiate the demarcation of their ancestral lands.
Land owners are suspected of killing several tribe members amid land-related disputes, according to human rights organizations. Rights groups said the Yukpa repeatedly denounced threats from ranchers, but authorities failed to act.
"There's a lot of tension in the region," said Lusbi Portillo, an Indian rights activist, told The Associated Press in an interview.
Portillo counts at least eight murders involving Yukpa tribe members in recent years.
"There are no investigations, nobody is arrested," added Portillo, a representative of Sociedad Homo et Natura, a non-governmental organization that closely tracks indigenous rights issues in Venezuela.
Portillo said that he has received anonymous death threats by telephone.
Romero's father, Jose Manuel Romero, was killed in 2009. Tribe members blame a local rancher for his slaying, but the alleged aggressor was never arrested or faced criminal charges, according to Portillo and human rights activists.
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