Relatives of the victims of Argentina's worst terrorist attack are asking the president to help bring to justice the people accused of masterminding the bombing.

They spoke at a ceremony on the anniversary of the 1994 attack on a Jewish community center that killed 85 people in Buenos Aires. Family members called on President Cristina Fernandez to put pressure on Iran to turn over the seven suspects accused in the bombing that also injured about 300 people.

Relatives also complained about the gridlock in an investigation that they said has failed to yield "a single new clue" in three years.

A long probe has been marked by judicial misconduct and charges of a state cover-up. No one has been convicted of carrying out the bombing and Iran denies any involvement.