Jewish leaders are asking Argentinian President Mauricio Macri to help solve Argentina's worst terrorist attack during its 22nd anniversary.
The 1994 bombing of the Argentine-Israeli Mutual Association killed 85 people.
Macri presented a flower wreath at Monday's ceremony as victims' families held photographs of their loved ones.
Survivors criticized previous governments for not solving the crime. They also called for answers in the mysterious death of the leading prosecutor investigating the attack.
Alberto Nisman's body was discovered in his apartment Jan. 18, 2015, with a gunshot wound to the head.
Nisman was scheduled to go before Congress the next day to present allegations that then-President Cristina Fernandez orchestrated a secret deal to cover up Iranian officials' alleged role in the attack. Fernandez denied it and judges threw out the case.
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