MOSCOW — A gas explosion in an apartment building in the south-central Russian city of Novosibirsk Thursday morning killed at least five people, including a 2-year-old child, the regional health ministry said.

Regional Gov. Andrey Travnikov said nine people had been taken to the hospital, with two in intensive care.

Ten people, including two children, who may have been inside when the explosion occurred at 7:43 a.m. remain unaccounted-for, authorities said.

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