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MEDIA, Pa. (CBS) — An apartment fire has killed one person in Delaware County. The fire broke out at a duplex at East Ridge Road near Providence Road in Media.

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It began around 3:30 a.m. Sunday.

A 54-year-old woman who was trapped on the first flood died and a second person and a pet dog managed to escape a second-floor apartment without injuries.

“Despite the efforts of the police and fire departments a resident of the building perished in the fire,” officials confirmed.

There’s no word yet on the cause. An active investigation is underway.

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“We ask that you keep the victims of this fire and their families in your thoughts and prayers,” officials added.

Commuters in the area can expect delays due to lane restrictions as officials continue to investigate.