The technology sell-off has carried over into Wednesday and oil prices rose 2% after the U.S. military launched attacks against Iran.
Futures for the S&P 500 declined 1.1% before the opening bell, while futures for the Dow Jones Industrial Average fell less than one percent. Futures for the technology-heavy Nasdaq slid 1.6%. The S&P 500 is coming off of its first losing week in the past 10.
The latest U.S. attack on Iran followed the crash of an Army helicopter near the Strait of Hormuz that President Donald Trump blamed on Tehran and has dimmed hopes for progress toward a permanent end to the war, now in its fourth month.