By Davide Barbuscia and Lewis Krauskopf

NEW YORK (Reuters) -Investors are bracing for more volatility after Wall Street’s summer lull gave way when markets reopened from the Labor Day unofficial end-of-summer holiday on Tuesday.

With September historically the worst month for the U.S. stock market, fears over Federal Reserve independence and President Donald Trump’s tariff uncertainty were at the fore, converging to jolt stocks and bonds.

Market participants have long fretted over frothy valuations in stocks and corporate bonds, even as signs of a slowing economy piled up this summer.

At the same time, an escalating spat between Trump and the Federal Reserve raised concerns that political strong-arming of the U.S. central bank could rattle the U.S. Treasury market, even as markets had

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