It's the 18th arson in and around Coatesville this year.
The fire was set about 9:30 on Tuesday night, on the back porch of a house on the 100 block of Chester Avenue.
Firefighters got to the house quickly and put out the flames in just a few minutes.
The fire damaged the back of the house, but did not injure anyone.
Officials in the Chester County community will conduct a special trash cleanup of porches on Wednesday.
And on Wednesday night, the city is holding a neighborhood watch information meeting.
There is a $20,000. reward for information leading to the arrest and conviction of the arson or arsonists who have set these fires.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.
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