In May 1998, Moshen Rabbani, (the Cultural Attaché in the Iranian Embassy in Argentina until December 1997) was detained in Germany, and the Argentine government expelled seven Iranian diplomats from the country, stating that it had "convincing proof" of Iranian involvement in the bombing. However, none of the suspects was prosecuted. In fact the attack occurred when Iran and Argentina were hoping for a resumption of nuclear cooperation, although Argentina had announced the suspension of the shipments of nuclear materials to Iran a couple months before the bombing.[8] A number of sources[9][10] report on Hezbollah involvement with the assistance of Syria.