Firefighters said they were called to three suspicious fires on the same Dravosburg property over the past six weeks.
Two firefighters were hurt early Tuesday morning while battling flames an abandoned home on Lebanon Church Road.
Firefighters said this was the second fire in less than a day and third fire in six weeks on the same property.
Channel 11 's Kelly Brennan reported that one firefighter was injured when he or she fell, and another was treated for heat exhaustion.
Both firefighters were taken to a local hospital and are expected to be OK.
"The biggest concern is firefighter safety. The guys want to come in and do their job and get out. But because of the terrain and whatever has been stored in it, it's certainly a concern for firefighter safety," Dravosburg Volunteer Fire Department Chief Wayne Cosgrove.
Neighbors said they're now worried about what will happen next.
"I just come home from work from the Pirates and end up seeing all this stuff and wake up again this morning to go to my main job and see it again. I'm like, 'Geez man. How many more times?'" said neighbor Keith Hall.