US STOCKS-Futures fall as Brussels attacks spark safety concerns
* Explosions in Brussels kill at least 26 people
* Airline stocks hit hardest
* Gold jumps about 1 pct
* Futures down: Dow 42 pts, S&P 7 pts, Nasdaq 18 pts (Adds details, comment, updates prices)
By Abhiram Nandakumar and Tanya Agrawal
March 22 (Reuters) - U.S. stock index futures were lower on Tuesday after explosions in Brussels sparked fresh geopolitical concerns and sent investors scurrying for safe-haven assets.
Two explosions tore through Brussels airport on Tuesday morning, in what Belgian public broadcaster VRT called a suicide attack, and another blast struck a metro station in the capital shortly afterwards. At least 26 people died in the attack.
European markets fell, while traditional safe havens gold and government bonds firmed up as reports of the events in the de facto capital of the European Union unfolded. Airline and travel-related stocks were the worst hit.
Shares of American Airlines, Southwest Airlines , Delta Airlines and United Continental Holdings were down between 3.4 percent and 1.1 percent in premarket trading. Continuación...