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Some videos appeared to show the object splitting into two or more smaller fireballs.
The National Weather Service said the fireball was not weather related.
"It was seen here in Las Vegas. Looks like space debris burning up. Not confirmed," NWS Las Vegas tweeted.
U.S. Strategic Air Command announced Thursday the fireball was identified as the remnants of a Chinese CZ-7 rocket body burning up while re-entering the earth's atmosphere.