CHICAGO (WLS) — One person was seriously injured in a fire at a Northwest Side apartment building Sunday afternoon, a Chicago Fire Department public information officer said.

The CFD said the fire broke out at a three-story apartment building in the 3200 block of North Kostner Avenue in the Belmont Gardens neighborhood just before 4:30 p.m.

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CFD transported one victim to Cook County Hospital in critical condition. Authorities did not provide details about that person’s injuries.

It was not immediately clear how the fire started.

Authorities did not immediately provide further information about the fire.