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Brussels attacks weigh on Wall Street; Apple, FBI court face-off canceled; Amazon's cable play

Wall Street is on edge after deadly attacks in Belgium spooked global markets. A series of explosions rocked Belgium's capital, targeting the main airport and the city's metro system. All three major indexes (^DJI^GSPC^IXIC) are lower in early trading, as investors seek safer assets such as gold                     (GCJ16.CMX) and treasuries (^TNX). 

American Airlines (AAL), United Continental (UAL), Delta Airlines (DAL), JetBlue (JBLU), and Priceline (PCLN) are among the airline and travel-related stocks that are under pressure in early trading following several deadly explosions in Brussels. 

Carnival (CCL) got the green light from the Cuban government to begin sailing to the Caribbean island nation in the beginning of May. This comes a day after President Obama's historic visit to Cuba. Carnival will be the first cruise ship in 50 years to sail from the U.S. to Cuba.    

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Petrobas (PBR) shares were down sharply in early trading. Brazil’s troubled state-run oil company posted a record loss of $10.2 billion for its fourth quarter ending in December, as the drop in oil prices forced the company to write down the value of some assets. 

Deutsche Bank (DB) shares are in focus after Moody's placed the German bank's rating on review for a possible downgrade. The rating agency cited “rising execution hurdles” as Deutsche Bank struggles to restructure businesses to increase profitability. 

FBI may be able to unlock Apple iPhone

There are new developments in Apple's (AAPL) battle with the FBI. Now the Justice Department says it might not need Apple’s assistance in opening an iPhone used by a gunman in the San Bernardino, California, attacks last year. The disclosure led a judge to cancel a court hearing that was supposed to start today.

Comcast, Amazon form partnership 

And one cable giant is turning to online retail. Comcast (CMCSA) has begun selling its TV, Internet and phone services through Amazon (AMZN), marking the company's highest-profile online retail partnership. A new page on the site, called "Amazon Cable Store,” sells the Xfinity-branded bundles and also offers promotional deals like a free Amazon gift card for signing up.

Presidential race heads West

The presidential candidates are heading west. Voters in Arizona and Utah will cast their votes in both parties’ primaries. In addition, Republicans in American Samoa hold their nominating convention, and Idaho will hold its Democratic caucus. This comes as Republican presidential candidate Donald Trump revealed the first members of his foreign policy team.