Pedranti said her son and several others were questioned in connection with the fire.
"He and others were involved," she wrote in an Instagram story. "My ex husband and myself take this very serious. This behavior is unacceptable and we are deeply sorry to our community. This is a tough learning moment for our son and our family."
Pedranti said no one was arrested.
According to Pedranti, her son is taking a fire safety course and said there will be consequences within their family for his actions.