Gaza militants fire dozens of mortars into Israel

PA and IDF don't let hamas mess around too much in West Bank.

Thats why it doesn't seem like it could be them, but with all the other factors it doesn't fit any of the other main groups really either. A new splinter perhaps(as though there ain't enough of them already) or a lone nut.
Also the Itamar murders, thats seems unusual also, a little bit like an old Hez incident but not very much.