Yes, all 40 were prison guards en route to a prison to evacuate prisoners..... beyond the 40, there are others who are missing..
"The fire spread from three locations simultaneously – making arson a likely possibility." "Deputy Minister Ayoub Kara (Likud), a resident of Usfiyeh, said on Channel 10 Thursday evening that he has received information that the fire is a terror act. ........"
"..... Large scale fires recently consumed 5,000 acres in the Golan Heights. A fire was set in the Gilad Farm several weeks ago and an Arab was seen fleeing by a group of soldiers in the area..
"The numerous large fires that broke out or were set this year depleted Israel's reserves of fire-fighting chemicals, and the supply of chemicals is expected to be used up completely by Friday morning. Israeli planes are reported to be en route to France to bring more supplies of fire-dousing materials.