Energy companies led a broad retreat on the stock market as prices for crude oil and natural gas took another tumble. Bank stocks also got beaten down Tuesday as investors worry that lenders could suffer if loans to overextended energy companies go bad. Several stocks also lost ground after reporting weak quarterly results. Royal Caribbean plunged 15% after its revenue missed estimates. The Dow Jones industrial average dropped 295 points, or 1.8%, to 16,153. The Standard & Poor's 500 index lost 36 points, or 1.9%, to 1,903. The Nasdaq composite gave up 103 points, or 2.2%, to 4,516. (More Dow Jones stories.)