Israeli site 0404 has documented that the fire last night that damaged a home owned by the Dawabashe family in Duma was the fourth one this year.
Besides the one last month that is being blamed on "settlers" based on nonsensical Hebrew graffiti, there was another fire on February 26. There was also a car that caught on fire on June 19 belonging to a member of the same family.
What a coincidence!
Also, I have not seen any evidence that the fire this morning was an electrical fire - just various people have made that assumption but as far as I can tell no one actually examined the damage and then came to that conclusion yet.
Remember also that it is not unheard of for Arabs to spray paint Hebrew graffiti after arson attacks.
(h/t Bob Knot)