US stocks are closing sharply higher, giving the stock market its best day in close to four years. Stocks are rebounding from a six-day slump that was prompted by concerns about the health of the Chinese economy. The Dow Jones industrial average climbed 619 points, or 4%, today. The Standard & Poor's 500 index jumped 72 points, or 3.9%, to 1,940. That's the biggest gain for the index since November, 2011. The Nasdaq composite surged 191 points, or 4.2%, to 4,697.
Treasury notes fell, pushing up the yield on the benchmark 10-year note to 2.18% from 2.07% yesterday. Cameron International, a maker of equipment for the oil industry, jumped 41% after Schlumberger said it was buying the company in a cash-and-stock deal. (Read more stock market stories.)