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SAN SALVADOR, El Salvador (AP) — El Salvador’s Supreme Court ordered Wednesday the re-opening of an investigation into the 1989 massacre of six Jesuit priests that sparked international outrage.

Attempts within El Salvador to investigate and prosecute the masterminds of the killings during the country’s civil war have been deflected by legal maneuvers since the high court declared the 1993 amnesty established after the war to be unconstitutional in 2016.

A lower court had ruled that an investigation could go ahead into the alleged involvement of a group of military officers and former President Alfredo Cristiani in the killings. But the probe was put on hold when the officers appealed the case to the Supreme Court in 2019.

Attorney General Rodolfo Delgado had pushed to reopen the case and welcomed Wednesday’s ruling.

“The case will be reopened,” Delgado wrote in his Twitter account. “We are going to go after those responsible, to bring justice for these vile killings.”

On Nov. 16, 1989, an elite commando unit killed the six priests — five Spaniards and one Salvadoran — along with their housekeeper and the housekeeper’s daughter in the priests’ residence. The killers tried to make the massacre appear as though it had been carried out by leftist guerillas.

Nine members of the military were initially put on trial, but a court absolved seven of them. Two officers served short sentences, but were released in 1993 under the amnesty. After the Supreme Court found the amnesty unconstitutional, a judge ordered one of those officers, Col. Guillermo Benavides, back to prison where he remains.

While the case stalled at home, a Spanish court in 2020 sentenced former Salvadoran Col. Inocente Orlando Montano to 133 years for the priests’ killings. The court called the massacre “state terrorism” carried out by powerful interests, including Cristiani, aimed at “holding onto their positions of privilege within the power structures.”

The former presiddnt has denied any involvement or knowledge of the plan to kill the priests. Attempts to reach him for comment after Wednesday’s ruling were not successful.