Others who have investigated the bombings (such as Mr Shchekochikhin) have come to a sticky end.

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We should also keep in mind that Apple, Google, Intel, and others have been investigated since 2009, and recently much more aggressively so, by the DOJ for colluding to maintain and even lower employee salaries by not poaching from one another, thereby creating a market devoid of information regarding true salaries.

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Police sources said some of the others being investigated included people who may have sat next to the hijackers or other suspects on previous flights.

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"Many people of many generations have unclean hands when it comes to this silence, " Williams said, adding that others could also be investigated.

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