We have trashed this Hagmann and his 'organization' before in a couple of threads (which I can't be bothered to look up).

Suffice it to say that the genuine experts in security keep a very low profile. They do not seek publicity and go to great lengths to keep their identities out of the media. These clowns are self-promoting charlattans; the only thing being "probed" is the gullibilty of the press and, by extension, the general public.

The bomb hoaxes are simple cause-and-effect. The media gleefully reports one, some neanderthal copycat emerges, the media reports that and so on...
Did the threats suddenly stop, or did the media finally realise they were being had and belatedly apply some editorial nous ?