Fire investigators are looking for the cause of an overnight structure fire in San Francisco, a dispatcher with the San Francisco Fire Department said.

Units responded to reports of fire at a home in the 4600 block of Third Street in the city’s South of Market District (Note: This block actually seems to be in the Bayview, we’re confirming the actual location of the fire now — EB) at around 4:40 a.m., the dispatcher said.

Firefighters had the one-alarm fire quickly extinguished and did not have any reports of residents being displaced.

The fire is under investigation.

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