The November 1979 Iranian hostage crisis of the U.S. embassy in Tehran precipitated a wave of anti-Iranian sentiment in the United States, directed both against the new Islamic regime and Iranian nationals and immigrants. Even though such sentiments gradually declined after the release of the hostages at the start of 1981, they sometimes flare up. In response, some Iranian immigrants to the U.S. have distanced themselves from their nationality and instead identify primarily on the basis of their ethnic or religious affiliations.