S&P 500 futures rose slightly on Tuesday as Wall Street looked to build on the momentum seen in the previous session amid developments in the Iran war. Futures linked to the broad market index rose 0.3%, while Nasdaq 100 futures climbed 0.2%. Futures tied to the Dow Jones Industrial Average added 161 points, or 0.3%. Volatile oil prices and the fallout of the Iran war continue to influence investor sentiment. On Tuesday morning, oil prices jumped 2%, with global benchmark Brent crude above the $100 mark. Oil’s bounce came after President Donald Trump suggested that a coalition to protect shipping along the Strait of Hormuz is still in the works. Trump told reporters Monday that some countries are “less than enthusiastic” about a plan to help escort oil tankers through the Strait of Hormuz. The president encouraged other nations to “get involved quickly and with great enthusiasm.” “We have some that are really enthusiastic. They’re coming already. They’ve already started to get there,” Trump said. “We’ll give you a list. Some are very enthusiastic, and some are less than enthusiastic, and I assume some will not do it. I think we have one or two that will not do it that we’ve been protecting for about 40 years at tens of billions of dollars.” Oil prices have surged since the start of the U.S.-Israel attacks on Iran on worries that a prolonged closure of the Strait of Hormuz could lead to a global disruption of energy supplies. Investors are watching for further developments on the war, especially after Iran’s security chief, Ali Larijani, was killed in airstrikes overnight. That’s according to Israeli Defense Minister Israel Katz. Many are crediting a relatively strong economy, contained inflation and strong earnings for continued momentum behind the stock market, but Bartlett Wealth Management president Holly Mazzocca said on Monday that “risks to that growth story are mounting.” “We came into this year with a pretty strong foundation, but especially the labor market has weakened pretty significantly. So that’s the big question for investors right now, is just being realistic that the overall risks to that continued growth story are higher today than they were just a few weeks ago,” Mazzocca said on CNBC’s “Closing Bell.” Treasury yields were relatively unchanged on Tuesday as investors weighed escalating tensions in the Middle East and rising oil prices ahead of the Federal Reserve’s policy decision. The benchmark 10-year Treasury yield was less than 1 basis point lower at 4.218%, while the 30-year Treasury bond added 1 basis point to yield 4.868%. The 2-year Treasury note yield fell more than a basis point to 3.669%. Asia-Pacific markets closed mixed as auto and tech stocks rose after Nvidia announced robust revenue forecast for its key chips, and partnerships with carmakers from the region. Australia’s S&P/ASX 200 added 0.36% to close at 8,614.3. Australia’s central bank on Tuesday raised benchmark policy rates for a second straight time to 4.1%. The 25 basis points hike was in line with expectations from analysts polled by Reuters, and comes as Australia’s inflation stays above the central bank’s upper limit of 3%. Japan’s Nikkei 225 closed flat at 53,700.39, while the Topix jumped 0.45% to 3,627.07. South Korea’s Kospi rose 1.63% to end the trading day at 5,640.48, while the small-cap Kosdaq lost 0.12% to 1,136.94. Hong Kong Hang Seng index rose 0.13% to 25,868.54, while mainland China’s CSI 300 lost 0.73% to 4,637.44. Gold prices inched higher on Tuesday, bolstered by safe-haven demand amid geopolitical jitters stemming from the Iran war, though gains were limited as investors remained cautious ahead of the U.S. Federal Reserve’s monetary policy decision. Spot gold was flat at $5,005.32 per ounce. U.S. gold futures for April delivery rose 0.04% to $5,00.30. “Gold is finding support as demand for safe-haven assets remains elevated amid the geopolitical and economic uncertainty created by the war in Iran,” said ActivTrades analyst Ricardo Evangelista.