China added to bond investors' jitters on Wednesday as tradersbraced for what they feared could be the end of a three-decade bullmarket.

Officials in Beijing reviewing the nation's foreign-exchangeholdings have recommended slowing or halting purchases of U.S.Treasuries, according to people familiar with the matter.Benchmark bonds reversed earlier gains on the news, with the yieldon 10-year Treasuries climbing for a fifth day.

China's foreign-exchange reserves of $3.1 trillion are theworld's largest, though it wasn't clear whether the recommendationshave been adopted. The market for U.S. government bonds is becomingless attractive relative to other assets, and trade tensions withthe U.S. may provide a reason to slow or stop buying American debt,the thinking of these officials goes, according to the people, whoasked not to be named as they aren't allowed to discuss the matterpublicly. China's State Administration of Foreign Exchange didn'timmediately reply to a fax seeking comment on the matter.