U.S. stocks extend losses ahead of Comey testimony

NEW YORK, June 6 (Xinhua) -- U.S. stocks ended lower after wavering between small gains and losses Tuesday, as investors became cautious ahead of former FBI Director James Comey's testimony scheduled for Thursday.

The Dow fell 0.23 percent, and the S&P 500 lost 0.28 percent, while the Nasdaq decreased 0.33 percent.