The US Treasury has imposed sanctions against companies connected with the Iranian Islamic Revolutionary Guards.
The action extends earlier sanctions against the Guards and its construction company headquarters.
It aims to freeze the foreign assets of four companies connected to Khatam al-Anbiya Construction and its chief officer.
The company’s profits help fund Iran’s nuclear and missile programmes, the US Treasury said.
Full Story: http://news.bbc.co.uk/2/hi/in_depth/8509020.stm