U.S. stocks indexes are lower in the afternoon trading, resulted from the declines in travel-related companies following the deadly attacks in Belgium.
Airlines, cruise companies and travel booking sites were among the biggest decliners early Tuesday. Delta Air Lines and Priceline fell 3 percent each and Royal Caribbean fell 4 percent.
In Europe stock market, Airline stocks fell between 2% and 5%. The companies includes carriers such as Air France KLM, British Airways operator IAG and Deutsche Lufthansa and Airport operators in Frankfurt and Paris were nearly 3% lower. Hotels group Accor fell 5% and Intercontinental Hotels declined 2%.
The Dow Jones industrial average fell 34 points, or 0.2 percent, to 17,590 as of 11:45 a.m. Eastern time.
The Standard & Poor's 500 index lost three points, or 0.2 percent, to 2,048. The Nasdaq composite edged up three points, or 0.1 percent, to 4,812.
Bond prices rose. The yield on the 10-year Treasury note fell to 1.89 percent.
Energy and materials companies were also lower. The price of crude oil slipped.
The terrorist attacks at Zaventem airport and at the Maelbeek metro station have led to at least 31 people killed and more than 230 people wounded, according to local reports and media.
"It's always a sad day when terrorism has to be the driver to kick markets from their state of calm," said Mike van Dulken, Head of Research at Accendo Markets. "It's also a sign of times when the market response is — in relative terms — so muted. Investors have had to develop a thick skin for such horrific events over the years."
The Islamic State (IS) group claimed that they are behind the attacks in a statement issued on the IS-linked agency.
Belgium has raised its terrorism alert to its highest level. Three days of national mourning have been declared.
Last November, 130 people were killed in in Paris restaurants, shops and a concert venue. This is another attack afterwards. French and Belgian governments now intensified efforts to identify and monitor terror suspects.