According to police, the two girls were playing outside in the snow while their families were inside attending church service in Illinois.
They created a tunnel out of the snow in which they became trapped, said Arlington Heights Police Sergeant Charles Buczynski.
The girls were found under the snow and according to the National Weather Service, temperatures dropped to -10C.
When the girls did not come back inside, their families went looking for them and found them under the snow.
The nine-year-old girl is currently being treated at a hospital in Arlington Heights, reported CBS Chicago.
The girls were reportedly stuck under the collapsed snow for up to one hour, but authorities couldn't be sure about that because no one witnessed the collapse, Buczynski told the Chicago Tribune.
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