A statement issued Thursday by the Revolutionary Guards of Iran rejected reports that the head of the country’s cyber warfare program, Mojtaba Ahmadi, was assassinated. They said they were investigating the circumstances of his death and the motives of his attacker or attackers. Ahmadi, last seen leaving his home for work Saturday, was found dead with two bullets in his heart in a wooded area near Karaz, northwest of Tehran. The local police chief said two people on a motorbike were involved in the shooting. The Guards statement does not deny that Ahmadi was attacked, only leaves its motive open.