They're using "collaboration" as their excuse:

Six Palestinians suspected of collaborating with Israel have been executed in the past two days by Hamas security officers in the fighting zone in Jabalya... Among the alleged collaborators were three brothers, one of whom attempted before his arrest to swallow a cell phone's SIM (Subscriber Identity Module) card, which is believed to have documented his conversations with Israeli security officials. Ynet has learned that in recent days Hamas reached the suspects in the area where Israeli ground forces have been operating and where air strikes continue simultaneously. An eyewitness said that among the dead were three brothers executed on the street.

This is a replay of the absolutely barbaric crimes - done with cold, unblinking efficiency - that Hamas committed when they took over the Gaza Strip. No wonder West Bank Fatah operatives are talking about Cast Lead as "Allah's revenge."

Let's see though. Coupled with the 35 civilians that they killed over the weekend that makes more than 40 Palestinian civilians murdered by Hamas in the last few days. That's an interesting number because it's also the inflated UN estimate from the school that Hamas transformed into a military base. And yet - no global outrage. It's almost like the world's concern for Palestinian civilians is selective.

References:
* Hamas Blowing Out The Kneecaps Of Fatah-Linked Gaza Civilians, Executing Dozens [MR]
* Hamas executes 6 suspected collaborators [YNet]
* Hamas Killing Babies And Wiping Out Fatah-Linked Families In Gaza, Preparing To Roll Fatah In The West Bank [MR]
* A Fatah Friend Writes: I'm Supporting the Israeli Air Force [Jeffrey Goldberg]
* Fatah loyalists: Gaza op is 'Allah's revenge' for Hamas actions [Ha'aretz]
* Palestinian Witnesses: Of Course Hamas Fired Mortars From UN School [MR]

Previously:
* Palestinian Non-Civil War Watch - Worst Flare-Up That Won't Lead To A Civil War In Two Weeks
* Palestinian Non-Civil War Watch (Bonus: It's the Jews' Fault. Of Course It Is)
* Amidst Non-Civil War, Palestinians Find Time To Bomb Israeli School House