The nation of Iran marking a milestone later on this week. On Thursday, the country will celebrate the anniversary of when it became an Islamic republic. This goes back to 1979, when supporters of the Ayatollah Khomeini, a religious leader, overthrew the country's government. Khomeini became the supreme leader of Iran, and the nation officially became an Islamic state. The United States and the European Union are worried about potential violence during Thursday's celebrations. U.S. and European Union are urging the Middle Eastern nation to "end its abuses against its own people." Iranian leaders have denied any accusations that the government has abused citizens.