WASHINGTON, Sept 13 (Reuters) – The United States is concerned that increased currency swap agreements between China and African nations will reduce visibility into financial transactions and will make it harder to prevent money laundering, a senior U.S. sanctions official said on Thursday.

Source: http://feeds.reuters.com/~r/reuters/AfricaNigeriaNews/~3/7xnhoBokqBg/idAFL2N1VZ2A3