(Reuters) — Argentina wants the United States to help it get to the bottom of a deadly 1994 bombing at the heart of a current political scandal by including the crime in the U.S. nuclear talks with Iran, its foreign minister said on Tuesday.

Argentine courts have accused a group of Iranians of planning the attack on the AMIA Jewish community center that killed 85 people.

The unresolved crime was the backdrop for the Jan. 18 death of the prosecutor who headed the AMIA investigation, a mystery that has damaged confidence in Argentina’s justice system and thrown the government into turmoil.

Foreign Minister Hector Timerman released a letter to his U.S. counterpart John Kerry in which he said Argentina had made the request before.

“I am asking you again that the AMIA issue be included in the negotiations with the Islamic Republic of Iran,” it said.

Days before being found shot dead, Alberto Nisman had accused President Cristina Fernandez of conspiring with Iran to whitewash the crime in order to clinch a grains-for-oil deal.

The death shocked Argentina as election season approaches and the economy teeters on the brink of recession. Pressure is mounting on Fernandez to find a way out of the scandal in time to help allied candidates in the October general election.

The United States and its partners in the nuclear negotiations with Iran have sought to keep talks focused on concerns over Iran’s atomic program.

U.S. negotiators, along with the other major powers of Britain, China, France, Germany and Russia, are unlikely to agree to include the AMIA bombing in the nuclear negotiations.

The Iranian suspects, facing Interpol arrest warrants, deny any involvement in the bombing.

Fernandez, who called Nisman’s accusation of an attempted cover-up “absurd,” is constitutionally barred from running in October for a third consecutive term.

Some of Nisman’s former colleagues in the state prosecutor’s office, who have frequently locked horns with the government, are organizing a silent march through Buenos Aires on Wednesday in his honor.

Government officials have called the march a stunt by the opposition aimed at driving Fernandez from office.

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