The Japanese government and the Bank of Japan said Friday they are concerned about the recent rapid weakening of the yen against the U.S. dollar."The government and the Bank of Japan will cooperate closely and monitor developments on the currency market and its impact to the economy and commodity prices with even more vigilance," they said in a joint statement issued also with the Financial Services Agency as their officials held a meeting.The expression of concern came after the yen briefly sank to a 20-year low against the U.S. dollar in the mid-134 yen range on Thursday. It is the first …READ FULL ARTICLE