The United States has imposed sanctions on Iran's maritime carrier and its affiliates for allegedly supporting Iran's nuclear and missile programs.

The designation against the Islamic Republic of Iran Shipping Lines and 18 affiliates means their assets under U.S. jurisdiction will be frozen.  Americans also are prohibited from doing business with the carrier and affiliates.

The United States announced the designation Wednesday, alleging the carrier and affiliates provided logistical support to Iran's Ministry of Defense and Armed Forces Logistics.

The United States has accused Iran of working to produce nuclear weapons.  Iran has rejected the allegation, saying its nuclear program is for peaceful purposes only.  

Some information for this report was provided by AFP, AP and Reuters.