Argentina’s highest criminal court reported a new development Thursday in the elusive quest for justice in the deadliest attack in the country’s history — the 1994 bombing of a Jewish community center headquarters — concluding Iran had planned the attack and Lebanon’s Hezbollah militant group had executed the plans.

In a ruling obtained by The Associated Press, Argentina’s Court of Cassation deemed Iran and its Lebanese proxy, Hezbollah, responsible for the bombing in Buenos Aires that leveled the community center, killing 85 people, wounding 300 and devastating Latin America’s biggest Jewish community. The court said the attack came in retaliation for Argentina reneging on a nuclear cooperation deal with Tehran.