SACRAMENTO, Calif. (AP) – A college professor suspected in a series of arson fires has been charged with setting a small blaze in a forest near the Dixie Fire. The Sacramento Bee reports the 47-year-old was arrested following an investigation that began July 20 and included a Forest Service agent placing a tracking device under his car. He’s charged with intentionally setting the Ranch Fire in Lassen County on Saturday. The newspaper says the suspect taught criminal justice. A judge says the nature of the case suggests the suspect may have mental health problems.