Although there's no proof, two Daily Mail articles state that Israel's Mossad was responsible for the Mahmoud al-Mabhouh hit in Dubai:
I can't imagine that the Mossad would steal Israeli identities to kill Mabhouh in Dubai even while an Israeli delegation made a historic visit under tremendous scrutiny. Despite the certainty of the Daily Mail headlines, you have to read on towards the bottom to find the important small print:
While Hamas has repeatedly accused Mossad of masterminding the assassination, rumours are swirling around the Middle East that the operation may have been carried out by a rival Palestinian group.
One other theory yesterday was that the attack was carried out by Mr al-Mabhouh's enemies within the Palestinian movement. Dubai police have arrested two Palestinians whom they claim are linked to the case.
The world's a better place without Mabhouh. Whether or not this is traced back to the Mossad, Palestinian rivals, or someone else, my sympathy goes to the victims of this identity theft.