As many as 100 Philly firefighters were dispatched to the 4700 block of Salem Street in the city's Frankford section for a two-alarm fire affecting multiple rowhouses at about 12:30 p.m., officials said on Twitter.
First responders brought the flames under control within about an hour of arrival, authorities said. No injuries have been reported, though "about 20" people have lost their homes, they added.
The cause of the fire remains under investigation, officials said.
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