CHELYABINSK, Russia — A small army of workers set to work Saturday to replace the estimated 50 acres of windows shattered by the shock wave from a meteor that exploded over Russia's Chelyabinsk region.

The astonishing Friday morning event blew out windows in more than 4,000 buildings in the region, mostly in the capital city of the same name and injured some 1,200 people, largely with cuts from the flying glass.

Fifteen of the injured remained hospitalized on Saturday, one of them in a coma, the regional health ministry said, according to the Interfax news agency.