U.S. Strategic Command spokeswoman Julie Ziegenhorn wouldn't say if the rocket ever posed danger to people on the ground. She says the command often sees re-entries.
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Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics, said observations from Utah indicated it was part of a Chinese rocket reentering the atmosphere. McDowell later said multiple agencies confirmed the light was caused by the Chang Zheng 7 rocket.
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Officials from Nellis Air Force Base in southern Nevada had earlier told KTNV-TV the light was a meteor breaking up.
The Associated Press contributed to this story.