6 February 2012 Updated at 12:09 ET
Obama sanctions Iranian Central Bank
Obama told NBC that he would work to prevent Iran obtaining a nuclear weapon
Iran nuclear crisis
Oil embargo impact
Q&A: Nuclear issue
Fears of Dubai Iranians
Q&A: Sanctions
US President Barack Obama has placed stricter sanctions on Iran's government, including its central bank.
link-
http://www.bbc.co.uk/news/world-us-canada-16914690