Closing Bell: Apple Launches iPhone 7; Beige Book Points to 'Modest' Growth

U.S. stocks settled narrowly mixed as questions over the Federal Reserve's rate hike plans continued to roil markets. Oil had a better day, closing at its best level in a week. The Fed's Beige Book, out this afternoon, reiterated a "modest" pace of growth in the U.S. economy. The release did point to some economic uncertainty, though, particularly surrounding the November presidential elections. Apple (AAPL) - Get Report revealed details of its latest product launch, the iPhone 7. The new smartphone includes water resistance, a longer battery life and stereo speakers. There is a lot of pressure on this model's performance to reverse a two-quarter decline in smartphone sales. U.S.-listed shares of Nintendo  (NTDOY) were in rally mode after its chief game designer announced Super Mario Run, a version of one of its flagship games, was coming to the iOS operating system. TheStreet's Keris Lahiff reports from Wall Street.