In response to an attack on two of its military bases in Iraq, the United States blacklisted eight senior Iranian officials and imposed sanctions on Iran’s metals, construction, manufacturing, textiles, and mining sectors. The new metals sanctions target the top steel, aluminum, copper, and iron producers in Iran as well as foreign purchasers and transporters of Iranian steel. The Treasury Department also announced sanctions waivers to allow the United States and foreign countries to investigate the downing of a commercial Ukrainian airplane in Tehran.