"A meteorite exploded above the Chelyabinsk region (of the Urals). The shock wave blew out windows in several places," but no meteor fragments hit the ground, an emergencies ministry spokesman told the Interfax news agency.
"According to the preliminary information, four people were injured by flying glass," the ministry added.
An agency report spoke of several injuries.
Witnesses cited by news agencies spoke of hearing loud explosions which led to panic among residents.