Spengler was paroled for the crime in 1998.

Police also have not located Spengler's 67-year-old sister, who lived in the house with Spengler.

Authorities also report that a total of seven houses were destroyed in the blaze.

UPDATE 12:40 p.m. EST: Police chief Gerald Pickering says that the gunman, who was killed at the scene, either by police or from a self-inflicted wound, may have set a trap for first responders.

UPDATE 12:15 p.m. EST: The Associated Press is reporting that the gunman who killed the two firefighters is also dead. His body was found at the scene. The names of the two deceased firefighters, according to the Democrat and Chronicle, are Mike Chiapperini, 43, a volunteer firefighter and the Webster Police Department’s public information officer, and Tomasz Kaczowka. The names of the wounded firefighters are Joseph Hofsetter and Theodore Scardino.

Early Monday morning two firefighters were shot and killed when responding to a call in Webster, New York, just outside Rochester. After the firefighters arrived at 191 Lake Road, an unknown shooter fired at them as they left their truck, killing two of them and wounding two others. The wounded men are at a nearby hospital; one is in stable condition, the other is in guarded condition.