Background Links:
Re Mosque - Discussion Thread and Research
http://www.freerepublic.com/focus/news/2408932/posts
Re 911: Memorial Page and Research
http://www.truthusa.com/911.html
Also relevant to what goes on in some mosques and I give you one guess, whether it would go on in this one:
"We closed the Taiba mosque because young men were being converted to religious fanatics there. A purported cultural association shamelessly exploited the freedoms of our democratic state under the rule of law to recruit for holy war behind the scenes. This cannot be tolerated.
"We have finally put an end to the spectre behind its walls. The association which ran it continuously promoted jihadist, aggressive and anti-democratic ideology and religious views.".
And more detail in this one:
Longtime al Qaeda operative runs mosque closed by German authorities
"Western intelligence agencies have suspected since the 1990s that the imam in charge of the mosque, Mamoun Darkazanli, is one of al Qaeda's top operatives in Europe."