East coast sonic blast and light flash from falling Soyuz debris.

So says U.S. Naval Observatory.

The mysterious boom and flash of light seen over parts of Virginia Sunday night was not a meteor, but actually exploding space junk from the second stage of a Russian Soyuz rocket falling back to Earth, according to an official with the U.S. Naval Observatory.

"I'm pretty convinced that what these folks saw was the second stage of the Soyuz rocket that launched the crew up to the space station," said Jeff Chester of the Naval Observatory in Washington, D.C.

Residents of the areas around Norfolk and Virginia Beach, Va., began calling 911 last night with reports of hearing a loud boom and seeing a streak of light that lit up the sky, according to news reports.

Chester heard about the incident this morning; the Naval Observatory gets plenty of reports of such fireballs and Chester investigated whether it could be a meteor or whether there were "any potential decays of space junk that were coming up," he told SPACE.com.

He checked the listing for debris that were expected to enter the lower atmosphere from their decaying orbits around this time period and found that second stage of the Soyuz rocket that launched last Thursday was slated to hit during a window that started at 8 p.m. last night. More