According to the ABC.es (daily, conservative national newspaper in Spain) article HERE , police are searching for 2 persons whom between 7:00 a.m. and 7:10 a.m. entered and left several trains in the train station of Alcalá de Henares. These two are suspected in leaving backpacks/bookbags full of explosives on the bombed trains.
_________________________
Visit BarcelonaMan.com for Barcelona information, Transportation, Lodging, & much MUCH more!

Curious about what could POSSIBLY be inside the brain of MadridMan? Visit MadridMan's Madrid Blog