Wall Street's main indexes opened higher on Tuesday as U.S. Treasury yields retreated following dovish comments from Federal Reserve policymakers overnight, though caution prevailed amid escalating tensions in the Middle East.

The Dow Jones Industrial Average rose 78.76 points, or 0.23 percent, at the open to 33,683.41.

The S&P 500 opened higher by 4.09 points, or 0.09 percent, at 4,339.75, while the Nasdaq Composite gained 21.57 points, or 0.16 percent, to 13,505.81 at the opening bell.

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