Police at the Alcanar attack scene on August 18, 2017 (Photo: AFP)

Police say they found more than 120 gas canisters in a house in Alcanar, where suspects in last week's twin assaults in Spain were believed to be building bombs for "one or more" attacks in Barcelona. Police say the terrorists planned to load a truck full of gas canisters to carry out a bigger attack, but that plot failed.