investigators in spain are looking at that explosion last night to see if that house might have been some kind of bomb making factory connected to a terror cell that then struck in barcelona today and maybe sfruk in cam brils tonight. one theory is that the possibility of today s truck attack in that pedestrian area in central barcelona, maybe that was actually a rushed attack as a result of that explosion last night that blew up the house. perhaps a bomb plot was the original plan and then the vehicle attack in barcelona today was a plan b after the attackers lost their source of explosives and they worried that their cell might be unravelled as investigators follow the leads from that explosive blast that happened last night. as i said, this is all these are all open questions at this point. we will learn more as this unfolds. we re learn more in days ahead. but the tactic in the downtown