"It is absurd to issue an amnesty law that seeks to cover all crimes, including crimes against humanity," said Alas.
The 1993 Amnesty Bill notably would have prevented charges being brought against those who orchestrated the assassination of St. Oscar Romero.
Romero, who was the Archbishop of San Salvador, was murdered while celebrating Mass on March 24, 1980. The day before his murder, he had preached a homily that implored the country's soldiers to stop committing human rights atrocities.
It is believed that he was killed by Salvadoran National Police Detective Óscar Pérez Linares, and that his assassination was ordered by Roberto D'Aubuisson, a politician and death-squad leader. Álvaro Rafael Saravia, who was chief of security for D'Aubuisson and involved in the death squads, was found to be liable for Romero's death, but has not yet been prosecuted.
After the 1993 law was repealed, a warrant was issued for Saravia, and the case was re-opened.
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Saravia remains in hiding. Linares and D'Aubuisson are now both deceased.
During El Salvador's 12-year civil war, an estimated 75,000 people were killed, and a further 10,000 people vanished. The conflict ended in 1992, following the singing of the Chapultepec Peace Accords.