MOSCOW, September 20. /TASS/. The number of people injured in a gas explosion in the Moscow Region has increased to 15, a source from the medical services of the Moscow Region told TASS.

"According to the data as of 8:00 p.m. (Moscow Time), 15 people were injured. Eight of them were hospitalized, while the rest received outpatient treatment," the source said.

The gas explosion occurred on the fourth floor of a residential building in Balashikha on Wednesday morning. As a result, three floors partially collapsed.