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Relevant
As soon as he has made an assertion he cites a 'source' to back it. In every case this is either an un-named former official or an unidentified secret document passed to Hersh in unknown circumstances. […] By my count Hersh has anonymous 'sources' inside 30 foreign governments and virtually every department of the U.S. government.
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Tagesschau.de has a fact check on the blog post (in German) and point out a few inconsistencies, including that it is hard to do an unnoticed mine laying mission in the middle of a major exercise because lots of people watching, the mine laying exercise was not specifically set up as cover but has been regular feature since 2014.
kl
https://en.m.wikipedia.org/wiki/Seymour_Hersh#Criticism_and_controversy