Finally some updated information about one of the murders from Haaretz.
http://www.haaretz.com/print-edition/news/hamas-hunts-men-who-executed-italian-activist-1.356320
As initial police work suggests, the murder was not committed by Hamas, and instead was committed by some fringe terrorist group that opposed Hamas. Hoping to use the murder victim to ransom prisoners held by Hamas. But even then, that fringe group murdered their captured victim shortly after making their ransom demand. In short a case where little is know, and who knows, what little is known may be a red Herring. But supposedly Hamas is trying to catch a Jordanian national.
With no land connection between Jordan and Gaza, it gets stranger and stranger every day.
All the more reason to not rush to judgment.