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CAPE CANAVERAL, Fla (CBSDFW.COM/AP) – There have been multiple reports of explosions and fire at the SpaceX launch facility in Florida.

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Twitter users are reporting they heard a loud explosion and are seeing smoke and fire. Some have even said they felt building shaking shortly after the explosions.

NASA says SpaceX was conducting a test firing of its unmanned rocket when the blast occurred Thursday morning. The test, considered routine, was in advance of a planned Saturday launch from Cape Canaveral Air Force Station.

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Buildings several miles away shook from the blast, and multiple explosions continued for several minutes. A cloud of dark smoke filled the overcast sky.

Additional details were not immediately available. But sirens could be heard in the aftermath.

The rocket was supposed to hoist an Israeli satellite this weekend.

*This is a developing story. Follow for more information.

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