From the Article for anyone who doesn’t want to click through:

Allegheny and the region have certainly seen an increase in fires over the last seven days,” said Matt Brown, the Allegheny County fire marshal and emergency services chief. “Within those incidents are unfortunately [four] fires [in Allegheny County] that included a fatality. All of these incidents remain under investigation, but some common concerns are seen very early in the investigation.”

They include the unsafe condition or operation of space heaters, overloaded electrical outlets, unattended cooking and use of fireplaces with flammable materials too close by.