Argentine prosecutors have again pushed for a conspiracy investigation against President Cristina Fernandez in the second appeal of a court decision that cleared her of trying to block the inquiry into a deadly 1994 bombing.

The accusation, that Ms Fernandez conspired to cover up Iran's alleged role in a truck bombing of the AMIA Jewish community center in Buenos Aires, threw her administration into turmoil when the claim was first levelled in January by state prosecutor Alberto Nisman.

It turned into a full-blown political scandal when Mr Nisman was shot dead in murky circumstances four days later.

Mr Nisman said Ms Fernandez had worked behind the scenes to clear Iran and normalise relations in order to clinch a grains-for-oil deal with Tehran.

She was exonerated by a judge in February, and a review panel agreed by a 2-1 vote this month there was not enough evidence to formally investigate the president.

But now the case has been brought to Argentina's top appeals court by newly assigned prosecutor German Moldes, who helped organize a march of tens of thousands last month to honor Mr Nisman and protest what demonstrators called a culture of intimidation and meddling in Argentina's justice system.

In his appeal, Mr Moldes accused Fernandez of being involved in "a hidden plan that benefited another country while going against the objectives and interests of Argentina."

Ms Fernandez calls the conspiracy accusation absurd and Iran denies any involvement in the bombing, in which 85 people died.