BALTIMORE (WJZ) — Several homes caught fire early Tuesday morning in South Baltimore, authorities said.

The fire was reported about 4:30 a.m. at five homes on South Hanover Street near Patapsco Avenue, the Baltimore City Fire Department said.

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Once crews arrived, the blaze shifted quickly into a three-alarm fire with a total of five buildings involved, a fire department spokesperson said.

Four of the buildings were vacant and one was occupied, but no injuries were immediately reported at the scene.

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While crews were fighting the fire, one building suffered a partial collapse and another later had a complete collapse, the spokesperson said.

By 9 a.m., the fire appeared to be contained with much of the area taped off.

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There’s no word yet on where or how the fire started.

Jessica Albert