Australian sources suggest that their intelligence service had questioned him about trips that he made to Iran, Lebanon and Syria, and Mossad's operation methods relating to foreign passports.

BBC: Israel and the curious case of Prisoner X

Their stealth and clandestine methods of operation allow them to conduct multiple missions against targets that larger forces cannot approach undetected.

CNN: Commentary: Where heroes come from

The US president said that many doubts were expressed about the operation by those who knew about it, because of the greater perceived risks in comparison with other possible methods such as air strikes, but that he welcomed this openness.

BBC: Bin Laden raid: Barack Obama describes 'huge risks'

The hacker Sabu has previously been tied to both LulzSec and an Anonymous operation that spilled 71, 000 emails from the security firm HBGary Federal, including a proposal that offered methods for cyberattacks and misinformation campaigns attacking WikiLeaks and its supporters as well as grassroots opponents of the U.S. Chamber of Commerce.

FORBES: Connect