The Argentine government's executive branch is criticizing the Justice Department ahead of a silent march organized by investigating attorneys demanding answers in the mysterious death of prosecutor Alberto Nisman.

Cabinet chief Jorge Capitanich told reporters Wednesday that the Justice Department "works on a corporative strategy with a tendency toward political destabilization."

Nisman, 51, was found shot dead in his apartment on Jan. 18. The next day, Nisman planned to take to Congress his allegations that President Cristina Fernandez and others in her administration reached a secret deal with Iran to shield officials allegedly involved in the 1994 bombing of Jewish community center. Fernandez has denied the allegations.

All the major opposition parties have said they plan to participate in the Wednesday afternoon march.