Stocks got hit by a selloff in the world's largest tech companies ahead of key central bank decisions. Bonds and gold climbed as traders rushed for safety amid geopolitical risks. Oil remained lower.
Israel's military struck Beirut, aiming at a Hezbollah commander, in response to a rocket attack on Saturday in the Golan Heights that killed 12 people.
Most shares in the S&P 500 rose, but renewed tech weakness weighed on the gauge — with Nvidia Corp. tumbling 5%.
After a $2.3-trillion Nasdaq 100 wipeout, investors awaited Microsoft Corp.'s results amid concern that firms aren't yet seeing returns from artificial intelligence. Its numbers will set the scene for reports from other heavyweighs this week, with markets also gearing up for Wednesday's Federal Reserve decision.
"If the Fed does not signal a September rate cut, markets could get a bit ugly given recent tech weakness — especially if earnings underwhelm," said Tom Essaye at The Sevens Report.
While the Fed is expected to hold benchmark rates at the highest level in more than two decades, traders will be closely watching for any hints that the start of policy easing is near. In the run-up to the announcement, data showed U.S. consumer confidence rose on an improved outlook for the economy and job openings beat forecasts.
The S&P 500 fell to around 5,435. The Nasdaq 100 slid 1.5%. A gauge of the "Magnificent Seven" megacaps sank 2%. The Russell 2000 of small firms was little changed.
Microsoft said it has started to resolve an outage affecting its Azure cloud service. CrowdStrike Holdings Inc. plunged on a report Delta Air Lines Inc. hired an attorney after a tech outage. Procter & Gamble Co. sank on a sales miss. JetBlue Airways Corp. soared on a turnaround plan.
Treasury 10-year yields dropped four basis points to 4.14%. West Texas Intermediate crude hovered near $75.
The yen rose. Bank of Japan Governor Kazuo Ueda will be under intense scrutiny Wednesday when he unveils his plans for quantitative tightening and delivers a decision on the policy interest rate.
Recent yen weakness has done more harm than good for the Japanese economy, according to Japan's newly appointed top foreign exchange official.