SINGAPORE, March 12 (Reuters) - Beijing has ordered refiners to stop refined fuel exports in March with immediate effect, to manage potential domestic fuel shortages caused by the Middle East conflict, four sources with knowledge of the matter said on Thursday.

The ban, issued by the National Development & Reform Commission (NDRC), includes shipments of gasoline, diesel and aviation fuel, the sources said.

The NDRC did not immediately respond to a request for comment.

(Reporting by Trixie Yap, Chen Aizhu and Siyi Liu; Editing by Jacqueline Wong)