By Tommy Wilkes LONDON (Reuters) – Stock markets fell on Monday as concerns over tighter regulations in China mounted amid caution ahead of a huge week for U.S. corporate earnings and a Federal Reserve meeting. The key event of the week for markets is the Fed meeting, where investors will look for Chair Jerome Powell’s comments about the timing for the start of tapering of the central bank’s asset purchases. This week also sees more than one-third of S&P 500 companies report quarterly results including Facebook Inc, Tesla Inc, Apple Inc, Alphabet Inc, Microsoft Corp and Amazon.com. Forecast-be…

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