Summary Box: Interest rates extend slide after snapshot of services businesses weakens

RATE SLIDE: Concerns that the U.S. economic rebound will fade boosted demand for Treasurys on Tuesday after a long holiday weekend.

ECONOMIC WORRIES: A trade group of purchasing executives said its index of services businesses slipped in June from May. The drop was steeper than analysts had forecast.

SHAKEY STOCKS: Demand for Treasurys remained even after stocks rose. Analysts said the buying in stocks wasn't because of a shift in sentiment but because the market had fallen too quickly. The Dow Jones industrials broke a seven-day slide.