(Bloomberg) -- A computer malfunction that knocked out trading at the New York Stock Exchange for more than three hours Wednesday probably stemmed from a software update that went awry, said two people briefed on a preliminary review.

The NYSE must now verify the cause and report its conclusions to the U.S. Securities and Exchange Commission, said the people who asked not to be named because the inquiry isn’t public. The SEC will use those findings to investigate whether any rule violations occurred, the people said.

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