The fire started around 7:30 p.m. Saturday in the 2700 block of Belmont Avenue.
Officials reported heavy fire showing from the third floor of a three-story twin house on arrival.
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It took almost an hour to bring the fire under control, which damaged both houses, officials say.
One person was taken to Crozier-Chester Medical Center. No word on their condition at this time.
The cause of the fire is under investigation.