South Korean Stocks Tumble, Triggering Second Trading Halt This Week

South ​Korean shares slumped more than 8%, as jitters over the valuations of companies riding the artificial-intelligence boom rattled the world's best-performing market this year.

U.S. Stocks Mixed as Micron Surges, Apple Slumps

The Dow Jones Industrial Average rose 0.14%, while the Nasdaq Composite fell 0.46%. The S&P 500 also edged down slightly.

Iran Attacks Cargo Ship, Testing Trump's Deal to Reopen Strait