Well, this would answer question #2 below...
Madrid blast investigators find detonators, Arabic tapes
Last Updated Thu, 11 Mar 2004 15:25:25
MADRID - Police investigating the series of deadly bombs that ripped across a Madrid train line say they have found a van with detonators and an Arabic-language tape with Qur'anic verses in a nearby town.
Well, this changes some things - and it seems I've been guilty of leaping to conclusions (No news there!). We await further developments with interest (keeping in mind that there is as yet not actual proof of who's responsible for the bombings, and that nobody has actually claimed responsibility).