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chanting, "we are not afraid." shaken but defiant. >> and james joins us live tonight. so many back out there sending a message, and still a fast-moving investigation tonight? >> reporter: well, that's right. it may look like life is back to normal here, but this is still very much a city on edge. authorities can't be sure of the full extent of the terror group, what they might have had planned next, and how many were involved. >> james, thank you. meantime, we're learning the attack was supposed to be much bigger. before this unfolded, an accidental house explosion revealing a terror cell, their whereabouts. and authorities believe the suspects decided they had to act fast. here's brian ross. >> reporter: spanish authorities tonight now say it could have been even worse. that a much more devastating attack was being planned in this villa outside barcelona by members of the isis-inspired terror cell.