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SpaceX Rocket Explodes After Florida Liftoff

The SpaceX Falcon 9 rocket and Dragon spacecraft breaks apart shortly after liftoff at the Cape Canaveral Air Force Station in Cape Canaveral, Flaorida, June 28, 2015.

An unmanned U.S. rocket carrying supplies to the International Space Station exploded shortly after lift-off Sunday, sending bits and pieces of its 2,300 kilograms of cargo plunging into the Atlantic Ocean.

It was the third time in eight months that a station shipment had failed, with a Russian cargo ship returning from the space station spinning out of control upon re-entry in April and another supply ship destroyed in a launch accident last October.

Sunday's failure occurred two minutes and 19 seconds into the flight from Cape Canaveral, Florida, when a 63-meter rocket owned by Space Exploration Technologies exploded against a deep blue sky. The rocket was traveling at more than 4,600 kilometers an hour 43 kilometers above the Earth when it broke up in a cloud of smoke.

Losing the shipment — including replacements for the cargo in the two previous failed missions — was a huge loss for the U.S. space agency NASA, which is counting on private industry to supply the International Space Station. SpaceX is one of the contenders for the ongoing supply runs and had carried out seven previous successful missions dating to 2012.

"It's not clear yet from the data what happened," said NASA launch commentator George Diller. "They are beginning to play back video to look and see if there are any indications in the video what may have happened."

SpaceX chief executive Elon Musk said the accident appeared to be linked to excessive pressure in the liquid oxygen tank of the rocket's upper stage.