A senior Iranian official announced that the country has created a special unit to defend the Islamic Republic against cyber attacks.Head of Iran\'s Civil Defense Agency General Gholamreza Jalali said Monday the command unit is headed by the armed forces but also includes officials from the defense and telecommunications ministries. It will also cooperate closely with the nation\'s intelligence agencies. Iran has been hit by at least two computer viruses recently that are part of a concerted campaign by the US and Israel to undermine the country\'s nuclear program. Last year, a powerful virus known as Stuxnet targeted Iran\'s nuclear facilities and other industrial sites and affected a limited number of centrifuges - a key component in nuclear fuel production.