sadiki, a member of german descent, who was arrested in july. he was taken in for questioning, and intelligence forces in germany say he is cooperating with that investigation, offering new details every single day. all of this sparked the u.s. state department security alert for americans traveling in europe to be extra vigilant. britain and japan issued a similar alert for their citizens. for a better understanding of this plot and the hamburg connection, we're joined now by terrorism analyst and investigative reporter mr. paul crookshank. he is in hamburg for us. here's what i want to ask you. we heard just now about the possible men who were in this drone strike, the german nationals in pakistan. what do we know about that? >> reporter: don, i think this is potentially quite significant. the taiba mosque is where some radicals were attending in it 2009. they decided to go to these areas of afghanistan.