Muslim Press - Supreme Leader of Islamic Republic of Iran Ayatollah Seyyed Ali Khamenei has condemned the United States and its elements for committing terrorist activities against Iranians.Addressing the families of Iranian martyrs in Tehran on Saturday, Ayatollah Khamenei named the shooting down of an Iranian passenger plane in 1988 as one of the US terrorist attacks against Iran.Recommended:Message of Seyyed Ali Khamenei to the Youth in Europe and North AmericaHe added that knowing one ' s enemies is one of the most important requirements of today ' s world and warned against attempts to cover up the crimes of the enemies. " Those who want to cover up the evil enmity of the US and and some of its followers through media and propaganda ploys are in fact betraying the nation and state, " Khamenei said.Read Also:The enemies of Islam have begun their counterattacks, Ayatollah Khamenei "The Iranian nation should through awareness of the extent of the enemy's hostility be prepared to confront and counter [its plots] in the soft war arena, such as in cultural, political and social spheres," he added.