A massive explosion erupted Thursday at SpaceX's main launch pad, destroying a rocket as well as a satellite that Facebook was counting on to spread internet service in Africa.
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There were no injuries. The pad had been cleared of workers before what was supposed to be a routine rocket test.
The mishap dealt a severe blow to SpaceX, still scrambling to catch up with satellite deliveries following a launch accident last year. It's also a setback for NASA, which has been counting on the private company to keep the International Space Station stocked with supplies and, ultimately, astronauts.
SpaceX was working to conduct a test firing of its unmanned Falcon rocket when the blast occurred shortly after 9 a.m. at Cape Canaveral Air Force Station. The test was in advance of Saturday's planned launch of an Israeli-made communications satellite that was supposed to provide home internet for parts of sub-Saharan Africa and the Middle East.
SpaceX said that in preparation for Thursday's engine firing — a test carried out a few days before every launch — "there was an anomaly on the pad resulting in the loss of the vehicle and its payload." No additional details were provided. It wasn't clear whether the rocket caused the problem or something else on the pad.
It's the same kind of SpaceX rocket used to launch space station supplies for NASA.
Buildings several miles away shook from the blast, and multiple explosions continued for several minutes — one right after another. Dark smoke filled the overcast sky. A half-hour later, a black cloud hung low across the eastern horizon.
TV cameras showed smoke coming from the launch pad nearly four hours later. The rocket was still standing, although the top third or so was clearly bent over.
The explosion occurred at Launch Complex 40 at the Air Force station, right next door to Kennedy Space Center. Kennedy emergency staff was on standby following the explosion. At the same time, personnel were monitoring the air for any toxic fumes. The Air Force stressed there was no threat to public safety in the surrounding communities.
The initial blast sent next-door NASA employees rushing frantically outside to see what happened. At first, it sounded like lightning, but was followed by the sounds of more explosions, then more and more.
Facebook spokesman Chris Norton said his company was "disappointed by the loss, but remain committed to our mission of connecting people to the internet around the world." Founder Mark Zuckerberg was in Kenya on Thursday, discussing internet access with government officials.
SpaceX is one of two companies shipping supplies to the International Space Station for NASA. The company also is working on a crew capsule to ferry station U.S. astronauts; that first flight was supposed to come as early as next year.
Two NASA astronauts were conducting a spacewalk 250 miles up, outside the International Space Station, when the explosion occurred. Mission Control did not notify them of the accident, saying all communication was focused on the spacewalk.
The California-based company, led by billionaire Elon Musk, had been ramping up with frequent launches to make up for a backlog created by a launch accident in June 2015. In that mishap, a support strut evidently snapped in the upper stage; the problem was fixed.
SpaceX was leasing the pad from the Air Force for its Falcon launches. The company is also redoing a former shuttle pad at Kennedy for future manned flights for NASA. The first crewed flight was supposed to take place by the end of next year. Boeing also is working to develop a crew capsule for NASA.
Sen. Bill Nelson, D-Fla., whose single space shuttle flight ended 10 days before the Challenger disaster in 1986, said the SpaceX accident "reminds us all that space flight is an inherently risky business."
"As we continue to push the frontiers of space, there will be both triumphs and setbacks. But at the end of the day, I'm confident that our commercial space industry will be very successful," Nelson said in a statement.
AP writer Rodney Muhumuza contributed to this report from Kampala, Uganda.