CHESTER, Pa. (CBS) — One person was injured overnight after fire ripped through an apartment building in Delaware County.

The two-alarm blaze broke out shortly after 1 a.m. Sunday at 5th and Barclay Streets in Chester.

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Authorities say the building was converted into multiple apartments but was not fully occupied at the time of the fire.

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One person was taken to the hospital in unknown condition.

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The cause of the fire is under investigation.