Stocks looked set to fall and oil was racking up further gains on Tuesday as investors fretted that the conflict in the Middle East would drag on. S&P 500 futures were 1.1% lower, and contracts tied to the tech-heavy Nasdaq 100 tumbled 1.4%. The moves lower came after Israel struck targets in Iran and Lebanon and Iran hit the U.S. Embassy in Saudi Arabia’s capital and other targets in Gulf states.