New York Times Thursday May 17
"Fatah retaliated by attacking a position of Hamas’s Executive Force, a parallel police force, killing four men. Another Fatah attack on the Executive Force prompted the Hamas men to take shelter in an apartment building, where they gathered the residents into the basement as Fatah forces surrounded the structure and shouted for revenge. The Fatah forces fired rocket-propelled grenades into the building of the Anour Tower and set it on fire."
The folks who fired grenades into a building full of hostages and set it on fire are the moderates.