BUENOS AIRES, Argentina—Thieves have stolen files on the mysterious desecration of former Argentine strongman Juan Peron’s grave from the home of a judge investigating the case.

La Nacion newspaper says a laptop and an electronic planner were also taken in Sunday’s break-in of judge Alberto Banos’ home.

Banos told the newspaper he was seeking access to classified government documents on the case and he believes the robbery was meant to intimidate him.

La Nacion reported the break-in Friday. Banos has declined to speak to the press further.

Peron ruled Argentina from 1946 to 1955 and again from 1973 until his death the following year. Thieves cracked open his tomb in 1987 and cut off both the corpse’s hands. They have never been found.