A man talks to a currency exchange dealer in a shopping centre in Tehran in 2010. Iranian police have cracked down on illegal money changers in Tehran, witnesses said, in an apparent bid to halt a ... more 

A man talks to a currency exchange dealer in a shopping centre in Tehran in 2010. Iranian police have cracked down on illegal money changers in Tehran, witnesses said, in an apparent bid to halt a dramatic plunge in the value of Iran's currency this week less