US futures dip as AI sell-off returns and oil prices rise sharply

U.S. futures are mostly lower as artificial-intelligence stocks come under pressure again and oil prices rose amid sporadic fighting in the Middle East.Futures for the S&P 500 fell 0.1% on Tuesday, while those for the Nasdaq declined 0.5%. Futures for the Dow Jones Industrial Average gained 0.2%.Shares of South Korea's AI company Elice Group tumbled 30% on its market debut with investors seemingly wary of the debt being taken on by companies in the sector, with a recent tech selloff gaining momentum again. AI companies perceived as vulnerable because of start-up costs, like CoreWeave in the U.S., are being targeted. Shares of CoreWeave, down 30% this month on such fears, tumbled 4.5% before the market opened.Anxiety over debt in the sector is being fanned due to inflation and rising odds that the Federal Reserve will hike borrowing costs for a second time this year to cool spending and borrowing.Benchmark U.S. crude jumped 2% to $100.55 a barrel. Brent crude, the international standard