The unmanned Falcon 9 SpaceX rocket lifts off from launch complex 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Friday, March 1, 2013. The rocket will transport the Dragon capsule to the International Space Station containing more than a ton of food, tools, computer hardware and science experiments. (AP Photo/John Raoux)

Update: The private SpaceX Dragon capsule has developed a problem on its way to the International Space Station. The trouble appeared nine minutes after Friday's launch from Florida.

SpaceX's billionaire founder Elon Musk is reporting via Twitter that there's a problem with the thrusters on the unmanned spacecraft. He says flight controllers are trying to override the system and fix the problem.

Musk is monitoring the flight from SpaceX Mission Control in California.

More than 1 ton of space station supplies is aboard the Dragon. It's supposed to arrive at the space station Saturday morning.

A commercial cargo ship rocketed toward the International Space Station on Friday under a billion-dollar contract with the U.S. space agency that could lead to astronaut rides in just a few years.

SpaceX, a private company run by the billionaire who helped create PayPal, launched its unmanned Falcon rocket right on time. It is the third supply run by a Dragon capsule.

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