It seems likely that it's Mossad. I'm sure that there are others who would be happy to see him dead, but there's something about the scale and complexity of the operation that suggests Mossad rather than random arms dealers or an Arab intelligence agency. What's really strange though is that Israel's supporters on here aren't rushing to claims this for Mossad. Why? They were handing out the Kol Hakovods like confetti on the bombing of the alleged Syrian reactor even before anybody had any idea what had actually happened. Yet here, they're suddenly silent. Al-Mabhouh was not a nice man and on past evidence they would have been happy enough if the IAF had killed him, even if a few innocent civilians had also died. Could it be that even they are a bit sickened by the cold ruthlessness of these ten smiling people setting out to choke the life out of a man? Not quite what Bibi hoped, I imagine, if this is Mossad.
from the article: Hamas man's Dubai death was a Mossad-style execution