Tech rout hits global stocks as AI rally fears mount

A sell-off in technology giants sparked a global stock decline, with the S&P 500 falling 1.4% and the Nasdaq dropping 2.2%. The Dow Jones Industrial Average closed just 0.1% lower. Asian markets saw sharper losses, with South Korea's Kospi plunging 10% from its record. Investors rotated into safe havens: US Treasuries rose, the Japanese yen and Swiss franc strengthened, while bitcoin lost 3% and oil dipped. The rout follows a nearly three-month surge in riskier assets and raises concerns that the artificial intelligence-driven bull market may be overextended.