Wall Street's main indexes opened mixed on Tuesday as fresh hostilities in the Middle East pushed oil prices to their highest since late July. The Dow Jones Industrial Average fell 303.8 points, or 0.57%, to 53,110.45 at the open. The S&P 500 slipped 0.8 points, or 0.01%, to 7,717.81, while the Nasdaq Composite rose 21.6 points, or 0.08%, to 26,528.571. Markets were also awaiting inflation data due later this week.