An initial investigation by the Fire & Rescue Authority on Thursday raised suspicions that at four areas of Haifa the fire was a result of arson.
Ran Shalf, the head of the Fire & Rescue Authority's investigations department, said that 60-70 percent of the cases were arson while the rest were a result of negligence.
"We're investigating ... there are cases, like in Dolev, where we see it's arson. There's physical evidence."