van careened through this pedestrian street cutting down tourists and locals. a moment frozen in time for those who survived. a moment they expected to die. authorities say it could have been so much worse. the sign simply reads, pray for barcelona. most tell us they were placing themselves for some sort of attack, hardly lessening the shock, sorrow or impact. this now say they believe that this terror assault was likely planning something, using massive explosive power. not just vehicles as a weapon. this is the working hypothesis. that explosives be being prepared in a house somewhere 150 miles from barcelona. on wednesday the house was destroyed in a massive blast. the police chief says the occupants appeared to have been trying to make explosives out of butane gas. did that force the cell to bring