CARELESSNESS OR TERRORISM?

For years Isis has suggested that its followers can cause a lot of destruction and chaos by setting wildfire's. Now that California is besieged by the worst wildfires in its history, why does no one suggest that they were set or fanned by Isis? It makes perfect sense that Isis could easily start conflagrations that could do great damage to the economies of California and other states. It also makes perfect sense that Trump would not want such a crime to be publicized.  Is it possible that there is great suspicion that Isis is behind these California wildfires, but that fact is being kept from he public to avoid any sense that a terrorist group has been able to wreak so much destruction on our country with retribution?