Two can play this game

A car bomb blew up in Iran, and according to CNN:

"According to FARS, Iranian officials said the explosives used in that attack
were manufactured in the United States. CNN could not verify those claims."

http://www.cnn.com/2007/WORLD/meast/02/16/iran.bombing/index.html

Now, this is most likely just rhetoric. But it proves that "anonymous souces" can be used by other countries, too. Something to think about when you read the news.