The officers were killed during a prison riot, La Prensa Garfica reported Monday. Officials said, however, they weren't sure how they died.
Guatemalan President Oscar Berger alleged organized gangs were responsible for the officers' deaths.
The killings are the latest twist in the case of three Salvadoran lawmakers found slain in Guatemala last week.
D'Aubuisson was the son of the late founder of El Salvador's ruling Arena Party, Roberto D'Aubuisson.
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