Russian emergency officials say six people are dead and four in serious condition after a gas explosion in an apartment building.

The explosion hit a two-story apartment building before dawn in the city of Ivanovo, 250 kilometers (150 miles) northeast of Moscow. The explosion tore out a large section of the brick building’s wall and collapsed some of the second story.

Russian news agencies cited a spokeswoman for the regional emergencies ministry, Olga Doleva, as saying the dead included a 4-year-old girl.