Weak earnings weigh on Wall Street; Fed awaited

U.S. stocks fell on Tuesday after weak results from a number of companies, including McDonald's and Gilead, dented investor sentiment. Investors are awaiting Apple's earnings later in the day and the outcome of the Federal Reserve's two-day meeting on interest rates that ends on Wednesday. The central bank is not expected to pull the trigger on interest rates in the near term as inflation remains below its 2 percent target and global growth continues to sputter.