Updated

Argentina's congress has approved a controversial treaty with Iran that is aimed at breaking a stalemate in the investigation of the South American country's worst terrorist attack.

Argentine prosecutors believe Iran's government ordered the 1994 Jewish center bombing that killed 85 people, and a list of Iranian officials have been on Interpol's watch list for years. Iran denies any role in the bombing, and has never allowed the suspects to be questioned.

The treaty would set up an independent "truth commission" and enable Argentina's prosecutors to interrogate the Iranian suspects in Teheran.

President Cristina Fernandez's government controls both houses of congress, where the treaty got final approval early Thursday after a very heated debate. Now it goes to Iran's parliament.