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(Reuters) - A meteorite streaked across the sky and exploded over central Russia on Friday, raining fireballs over a vast area and causing a shock wave that smashed windows, damaged buildings and injured 1,200 people.

People heading to work in Chelyabinsk heard what sounded like an explosion, saw a bright light and then felt the shock wave, according to a Reuters correspondent in the industrial city 1,500 km (950 miles) east of Moscow.

The fireball, travelling at a speed of 30 km (19 miles) per second according to Russian space agency Roscosmos, had blazed across the horizon, leaving a long white trail that could be seen as far as 200 km (125 miles) away.

Car alarms went off, thousands of windows shattered and mobile phone networks were disrupted. The Interior Ministry said the meteorite explosion, a very rare spectacle, also unleashed a sonic boom.

"I was driving to work, it was quite dark, but it suddenly became as bright as if it were day," said Viktor Prokofiev, 36, a resident of Yekaterinburg in the Urals Mountains.

"I felt like I was blinded by headlights."

The meteorite, which weighed about 10 metric tons and may have been made of iron, entered Earth's atmosphere and broke apart 30-50 km (19-31 miles) above ground, according to Russia's Academy of Sciences.

The energy released when it entered the Earth's atmosphere was equivalent to a few kilotonnes, the academy said, the power of a small atomic weapon exploding.

No deaths were reported but the Emergencies Ministry said 20,000 rescue and clean-up workers were sent to the region after President Vladimir Putin told Emergencies Minister Vladimir Puchkov to ease the disruption and help the victims.

The Interior Ministry said about 1,200 people had been injured, at least 200 of them children, and most from shards of glass.

WINDOWS BLOWN OUT

The early-morning blast and ensuing shock wave blew out windows on Chelyabinsk's central Lenin Street, buckled some shop fronts, rattled apartment buildings in the city center and blew out windows.

"I was standing at a bus stop, seeing off my girlfriend," said Andrei, a local resident who did not give his second name. "Then there was a flash and I saw a trail of smoke across the sky and felt a shock wave that smashed windows."

A wall and roof were badly damaged at the Chelyabinsk Zinc Plant but a spokeswoman said no environmental threat resulted.

One piece of meteorite broke through the ice the Cherbakul Lake near Chelyabinsk, leaving a hole several meters (yards) wide.

The region has long been a hub for the Russian military and defense industry, and it is often the site where artillery shells are decommissioned.

A local Emergencies Ministry official said meteorite storms were extremely rare and Friday's incident may have been connected with an asteroid the size of an Olympic swimming pool that was due to pass Earth.

But an astronomer at Russia's Academy of Sciences, Sergei Barabanov, cast doubt on that report and the European Space Agency said its experts had confirmed there was no link.

The regional governor in Chelyabinsk said the meteorite shower had caused more than $30 million in damage, and the Emergencies Ministry said 300 buildings had been affected.

Despite warnings not to approach any unidentified objects, some enterprising locals were hoping to cash in.

"Selling meteorite that fell on Chelyabinsk!" one prospective seller, Vladimir, said on a popular Russian auction website. He attached a picture of a black piece of stone that on Friday afternoon was priced at 1,488 roubles ($49.46).

RARE EVENT

The Emergencies Ministry described Friday's events as a "meteorite shower in the form of fireballs" and said background radiation levels were normal. It urged residents not to panic.

The first footage was shot by car dashboard video cameras and soon went viral.

Russians also quickly made fun at the event on the Internet. A photo montage showed Putin riding the meteorite and Nationalist politician Vladimir Zhirinovksy said in jest it was really a new weapon being tested by the United States.

Experts drew comparisons with an incident in 1908, when a meteorite is thought to have devastated an area of more than 2,000 sq km (1,250 miles) in Siberia, breaking windows as far as 200 km (125 miles) from the point of impact.

Simon Goodwin, an astrophysics expert from Britain's University of Sheffield, said that roughly 1,000 to 10,000 metric tons of material rained down from space towards the earth every day, but most burned up in the atmosphere.

"While events this big are rare, an impact that could cause damage and death could happen every century or so. Unfortunately there is absolutely nothing we can do to stop impacts."

The meteorite struck just as an asteroid known as 2012 DA14, about 46 m in diameter, was due to pass closer to Earth - at a distance of 27,520 km (17,100 miles) - than any other known object of its size since scientists began routinely monitoring asteroids about 15 years ago.

($1 = 30.0877 Russian roubles)

Meteorite Shower Hits Russia

Russian meteor explosion: Spectacular dash cam video of meteorite fireball falling in Urals

CNN coverage

JUST HOURS LATER AN ASTEROID THE SIZE OF A FOOTBALL FIELD PASSED EARTH BY?17,150 MILES.

Via Fox News

A 150-foot asteroid hurtled through Earth's backyard Friday, coming within an incredible 17,150 miles and making the closest known flyby for a rock of its size. In a chilling coincidence, a meteor exploded above Russia's Ural Mountains just hours before the asteroid zoomed past the planet.

Scientists the world over, along with NASA, insisted the meteor had nothing to do with the asteroid since they appeared to be traveling in opposite directions. The asteroid is a much more immense object and delighted astronomers in Australia and elsewhere who watched it zip harmlessly through a clear night sky.

"It's on its way out," reported Paul Chodas of?NASA's Near-Earth Object program?at Jet Propulsion Laboratory in California.

Asteroid 2012 DA14, as it's called, came closer to Earth than many communication and weather satellites orbiting 22,300 miles up. Scientists insisted these, too, would be spared, and they were right.

The asteroid was too small to see with the naked eye even at its closest approach around 2:25 p.m. EST, over the Indian Ocean near Sumatra.

The best viewing locations, with binoculars and telescopes, were in Asia, Australia and eastern Europe. Even there, all anyone could see was a pinpoint of light as the asteroid buzzed by at 17,400 mph.

As asteroids go, this one is a shrimp. The one that wiped out the dinosaurs 65 million years ago was 6 miles across. But this rock could still do immense damage if it ever struck given its 143,000-ton heft, releasing the energy equivalent of 2.4 million tons of TNT and wiping out 750 square miles.

By comparison, NASA estimated that the meteor that exploded over Russia was much smaller -- about 49 feet wide and 7,000 tons before it hit the atmosphere, or one-third the size of the passing asteroid.

As for the back-to-back events, "this is indeed very rare and it is historic," said Jim Green, NASA's director of planetary science. While the asteroid is about half the length of a football field, the exploding meteor "is probably about on the 15-yard line," he said.

"Now that's pretty big. That's typically a couple times bigger than the normal influx of meteorites that create these fireballs," he said in an interview on NASA TV.

"These fireballs happen about once a day or so, but we just don't see them because many of them fall over the ocean or in remote areas. This one was an exception."

As the countdown for the asteroid's close approach entered the final hours, NASA noted that the path of the meteor appeared to be quite different than that of the asteroid, making the two objects "completely unrelated." The meteor seemed to be traveling from north to south, while the asteroid passed from south to north -- in the opposite direction.

Most of the solar system's asteroids are situated in a belt between the orbits of Mars and Jupiter, and remain stable there for billions of years. Some occasionally pop out, though, into Earth's neighborhood.

NASA scientists estimate that an object of this size makes a close approach like this every 40 years. The likelihood of a strike is every 1,200 years.

The flyby provides a rare learning opportunity for scientists eager to keep future asteroids at bay -- and a prime-time advertisement for those anxious to step up preventive measures.

Friday's meteor further strengthened the asteroid-alert message.

"We are in a shooting gallery and this is graphic evidence of it," said former Apollo astronaut Rusty Schweickart, chairman emeritus of the?B612 Foundation,?committed to protecting Earth from dangerous asteroids.

Schweickart noted that 500,000 to 1 million sizable near-Earth objects -- asteroids or comets -- are out there. Yet less than 1 percent -- fewer than 10,000 -- have been inventoried.

Humanity has to do better, he said. The foundation is working to build and launch an infrared space telescope to find and track threatening asteroids.

If a killer asteroid was, indeed, incoming, a spacecraft could, in theory, be launched to nudge the asteroid out of Earth's way, changing its speed and the point of intersection. A second spacecraft would make a slight alteration in the path of the asteroid and ensure it never intersects with the planet again, Schweickart said.

Asteroid DA14 -- discovered by Spanish astronomers only last February -- is "such a close call" that it is a "celestial torpedo across the bow of spaceship Earth," Schweickart said in a phone interview Thursday.

NASA's deep-space antenna in California's Mojave Desert was ready to collect radar images, but not until eight hours after the closest approach given the United States' poor positioning for the big event.

Scientists at NASA's Near-Earth Object program at California's Jet Propulsion Laboratory estimate that an object of this size makes a close approach like this every 40 years. The likelihood of a strike is every 1,200 years.