One Israeli media outlet says it was a Mossad hit. Inyan Merkazi says that Mabhouh was negotiating a deal to transfer arms from Iran to Gaza and was killed by four Mossad hitmen who first interrogated him and got lots of good information.

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PROTOCOLS: EXPOSING MODERN ANTISEMITISM
If you want real peace, don't insist on a divided Jerusalem, @USAmbIsrael
The Apartheid charge, the Abraham Accords and the "right side of history"
With Palestinians, there is no need to exaggerate: they really support murdering random Jews
Great news for Yom HaShoah! There are no antisemites!