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Thu Jan 4, 6:08 PM ET

PETERSON AIR FORCE BASE, Colo. - A spent Russian booster rocket re-entered the atmosphere Thursday over Colorado and Wyoming, the North American Aerospace Defense Command said.

Eyewitnesses reported seeing flaming objects in the sky at the time the rocket was re-entering, NORAD spokesman Lt. Cmdr. Sean Kelly said.

"It was pretty spectacular," said Riverton Police Capt. Mark Stone, who said he saw the burning object while he was retrieving his newspaper. "My first concern is that we had some sort of aircraft that was coming down. It was definitely leaving a burning debris trail behind it."

Stone said he could tell it was fairly large object, but it was too high to make out exactly what it was.

Kelly said the agency was unable to confirm a report that a piece of the rocket may have hit the ground near Riverton, Wyo., at about 6 a.m. MST.

No damage was reported, and any debris that may have hit the ground was not believed to be hazardous, NORAD said.

NORAD identified the rocket as an SL-4 that had been used to launch a French space telescope in December, and Kelly said U.S. spacewatchers knew the rocket was coming down.

"Objects falling from space are almost an everyday occurrence," Kelly said.

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