The number of people injured in a gas explosion in northern Moscow has risen to seven, law enforcement officials told TASS, Paralel.Az reports.

"Three adults and four children were injured as a result of the gas blast," the source said.

He added that the area of the collapsed partition was currently 100 square metres. The fire has been extinguished, he said.

Meanwhile, the gas blast was not the cause of the accident, another source said, adding that investigators were working at the site.

"The cause of the explosion is not gas. Investigators are now working at the site to find out why there was an explosion followed by a fire," the source said.