Rafid Ahmed Alwan al-Janabi, known by the Central Intelligence Agency cryptonym "Curveball", was an Iraqi citizen (now a German citizen) who defected from Iraq in 1999, claiming that he had worked as a chemical engineer at a plant that manufactured mobile biological weapon laboratories as part of an Iraqi weapons of mass destruction program. He was found to have fabricated (with help) his stories of WMDs in Iraq. He has since been used as an example for anti-Anglo/American sentiment.
There are claims in the media and on Wikipedia, that Germany gave clear warning of 'Curveball' and deemed him as unreliable. However George Tenet, the CIA Director at the time, insists that the first he heard about Curveball's unreliability from Germany was two years after the invasion – "too late to do a damn thing about it".
It seems 'Curveball' was a German Intelligence BND asset, for the purposes of providing fake intelligence to discredit the US and UK.
The 9/11 perpetrators were known as the "Hamburg Cell". This video mentions the chief of Hamburg Police at the time of 9/11, later became the head of the BND. Read this Telegraph Article, demonstrating the same pattern with 9/11 intelligence as the curveball issue, where Germany issued supposed warnings etc, yet the truth is different.
One of the main people supplying 'info' to the propagandists pushing the "9/11 was an inside job" view is Andreas von Bülow , linked with German Intelligence, and actively providing the disinformation to conspiracy theorists, to paint the conspirators to be feared as their own ("Zionist Occupied") democracies. Subversion.
Note that the NWO/911/WMD conspiracy theories never talk about Germany.