A Peruvian ex-army officer known as the "Butcher of the Andes" and accused of killing 69 peasants in the 1980s, was extradited to Peru from the United States late on Thursday to face charges, police said.
Telmo Hurtado is accused of commanding a military patrol in the southeast of the country that killed the peasants, including 30 children and 27 women, in 1985 during Peru's war against Shining Path Maoist guerrillas.
He was to appear before a national criminal court on Friday, which will decide where he will be held while the case is developed against him, said Karim Ninaquispe, a lawyer for families of the victims.
Hurtado is alleged to have taken part in the infamous "Accomarca Massacre" on August 14, 1985, when army units entered the Quebrada de Huancayoc village, herded villagers into houses and set them alight, killing dozens.
Hurtado was included in a blanket amnesty granted to military officers in the 1990s but lost his immunity when the Supreme Court nullified the law in 2002, at which point he moved to the US city of Miami, Florida.
He was arrested by US authorities in 2007 and the following year was ordered to pay $37 million after a case brought by the Center for Justice and Accountability, a rights group representing two witnesses to the massacre.
Around 70,000 people, mostly civilians, were killed during Peru's war on leftist Shining Path and Tupac Amaru rebel groups in the 1980s and 1990s.