Firefighters battled flames at a row home in the 400 block of Chestnut Street in Allentown Wednesday evening.
Crews were called around 6:15 to a home in the middle of the row. They found flames bursting out of two upper story windows, fire officials said.
It's unclear if anyone inside the home was injured. No firefighters were hurt battling the blaze.
The second and third stories of the home were seriously damaged, officials said.
A cause is yet to be determined.