Spanish police arrested on Friday former Argentine President Isabel Peron, who is wanted in her home country for an investigation into killings of dissidents before the 1976-1983 military dictatorship, police sources said.Peron, the widow of Argentina's former President Juan Domingo Peron and whose full name is Maria Estela Martinez de Peron, was arrested at her home in Villanueva de la Canada, a town in the province of Madrid, the sources said. Her arrest came a day after an Argentine judge issued an international arrest warrant for Peron. Federal Judge Raul Acosta wants to question her in a case involving the 1976 disappearance of a man whom rights groups claim was last seen being taken into custody by state security officials.