The six British passports used by the group that liquidated Mabhouh in Dubai belonged to British immigrants to Israel. Mossad is a natural suspect in the identity theft, but the institution does not normally operate so simplistically. Involving Israeli civilians in Mossad operations is a big no-no.
Either Mossad deliberately made its involvement transparent to scare the terrorists, or—less likely—it was framed, or we see a major operative blunder here.
Maybe it was worth it, even despite the high price. This guy might have been more than a gun-runner.
Terrorist thug!!