SINGAPORE, May 6 (Reuters) - U.S. crude prices fell more than $1 to $78.96 a barrel on Thursday, as the euro slumped while global stock markets tumbled on fears that Greece's economic crisis may spread to other European nations.
By 0654 GMT, crude was down 94 cents a barrel at $79.03, after sliding $1.01, and reversing earlier gains. (Reporting by Florence Tan; Editing by Ramthan Hussain) (florence.tan@thomsonreuters.com; + 65 6870 3497; Reuters messaging: florence.tan.thomsonreuters.com@reuters.net))