NNA - Iran blamed Israel for a drone attack on a military factory near the central city of Isfahan, the semi-official ISNA news agency said on Thursday, vowing revenge for what appeared to be the latest episode in a long-running covert war.

In a letter to the U.N. chief, Iran's U.N. envoy, Amir Saeid Iravani, said "primary investigation suggested Israel was responsible" for Saturday night's attack, which Tehran had said caused no casualties or serious damage.

"Iran reserves its legitimate and inherent right to defend its national security and firmly respond to any threat or wrongdoing of the Zionist regime (Israel) wherever and whenever it deems necessary," Iravani said in the letter.

"This action undertaken by the Zionist regime (Israel) goes against international law." -- Reuters

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