Fragments of at least one meteorite fell in the Chelyabinsk region some 930 miles east of Moscow, causing flashes in the morning sky and sharp explosions, Russian officials said Friday.

The office of the governor of the region in the Ural Mountains said in a statement that many calls about injuries and damage to buildings had been received. But there were no immediate confirmed figures or specific reports on damage.

CBS News sources say there's no word of serious injuries anywhere, but some people were hurt from broken glass.

Reports conflicted on the event: A spokeswoman for Russia's Emergency Ministry, Irina Rossius, told The Associated Press there was a meteor shower, but another ministry spokeswoman, Elena Smirnikh, was quoted by the Interfax news agency as saying it was a single meteorite.

The ministry said some fragments fell near the town of Satka, about 120 miles from the regional capital city of Chelyabinsk.