U.S. stocks closed mostly lower on Friday, with major indexes posting modest weekly declines as investors grappled with lingering uncertainty over trade negotiations between the U.S. and China, as well as bond yields that climbed this week to the highest level since 2011. The Dow Jones Industrial Average closed nearly unchanged at 24,715.09, leaving it with a 0.5% weekly loss. The S&P 500 index fell 7.15 points, or 0.3% to 2,712.98 and ended the week 0.5% lower. Meanwhile the Nasdaq Composite declined 28.13 points, or 0.4% to 7,354.34 and fell 0.7% over the week. The Russell 2000 index of small-capitalization stocks rose 2.8 points, or 0.2%, to 1,628.12, a third record close in a row. For the week, the index rose 1.3%. Among the worst performers on the S&P 500, Campbell Soup Company shares plunged 12% after the company reported quarterly result and cut its full-year outlook.