The United States imposed sanctions on 11 companies and individuals for supplying Iran's ballistic missile program in a move delayed by over two weeks so as not to endanger this weekend's release of U.S. prisoners, sources familiar with the matter said.

The U.S. Treasury Department said it had blacklisted the UAE-based Mabrooka Trading, and its owner, Hossein Pournaghshband, for helping Iran's produce carbon fiber for the program. Financial institutions and companies are barred from dealing with those on the U.S. blacklist.

U.S. official and congressional sources said President Barack Obama's administration had held back from taking action for more than two weeks during the tense negotiations that ultimately freed five Americans under a prisoner swap.