New York - Petroleum-linked stocks led the broader US stock market lower on Wednesday, while airlines and most travel stocks fell again one day after the deadly Brussels attacks.
The Dow Jones Industrial Average dropped 79.98 points (0.45%) to 17 502.59.
The broad-based S&P 500 shed 13.09 (0.64%) to 2 036.71, while the tech-rich Nasdaq Composite Index fell 52.80 (1.10%) to 4 768.86.
Dow member Chevron fell 2.0%, while ConocoPhillips tumbled 4.9% as US oil prices fell below $40 a barrel.
The bombings in Brussels on Tuesday that killed 31 people and wounded some 270 continued to reverberate through the market, hitting especially shares of companies tied to travel and tourism as security tightened across Europe.
United Airlines lost 1.2% and hotel chain Hilton Worldwide shed 1.5%. Online travel stocks TripAdvisor and Priceline also fell.
Dow member Nike fell 3.8% after reporting that third-quarter sales were $8bn, below the $8.2bn expected by analysts. The results raised concerns about the sneaker and sports apparel giant ahead of a heavy summer season for sports that includes the 2016 Olympics.
Gilead Sciences lost 3.9% after a California jury ruled that rival drug company Merck should be able to seek royalties for Gilead's profitable Sovaldi drug for hepatitis C. Dow member Merck rose 0.1%.
Software company Red Hat lost 3.1% as it reported fourth-quarter earnings of $53%, up 10.4% from the year-ago period. However, Briefing.com said the company's $764m in billings came in a bit below expectations.
Yum Brands rose 2.0% following reports the company, which owns the KFC, Pizza Hut and Taco Bell chains, is in talks to sell a stake in its China operations.
Analysts said the market was due for a pause.
"The market's been pretty strong for a while and it's time we consolidate the recent gains," said Bill Lynch, director of investment at Hinsdale Associates. "There may be some profit-taking."