Well, succintly:
Very probably 3/11 was carried out by ETA, although Secret Services are not discarded. The Socialist won the elections saying it was Al Qaeda, and now those Socialists get tachycardic when any link between ETA and 3/11 resurfaces.
If you have time, read the previos posts. There are lots of data on the links. I warn you the plot is complicated and evidences are subtle. It is the real world and not Hollywood.
Thank you very much; I'll be reading.