A preliminary investigation into the attack on the Iranian Defense Ministry facility in Isfahan showed that Israel was responsible for the attack, the Islamic republic's permanent representative to the UN, Amid Saeed Iravani, said, ISNA news agency reported Thursday.

"The results of the preliminary investigation show that the Zionist regime is responsible for the terrorist attack on the Defense Ministry facility in the city of Isfahan, the actions of this regime violate international law and are condemned," Iravani said in a letter sent to the UN secretary general and the chairman of the world organization's Security Council.