A meteorite contrail hangs over the Chelyabinsk region of Russia this morning. The space rock set off explosions that injured hundreds.

MOSCOW — A meteor that scientists estimate weighed 11 tons streaked at supersonic speed over Russia’s Ural Mountains today, setting off blasts that injured some 500 people and frightened many more.

The Russian Academy of Sciences said the meteor over the Chelyabinsk region entered the Earth’s atmosphere at a speed of at least 33,000 mph and shattered about 18 to 32 miles above ground.

The fall caused explosions that broke glass over a wide area. More than 500 people sought treatment.