“Spanish police have found more than 120 gas canisters at a house in Alcanar where the suspects in this week’s twin terror attacks were believed to be building bombs for as many as three attacks. ‘We’re starting to see clearly that (the Alcanar house) was the place where they were preparing explosives for one or more attacks in in the city of Barcelona,’ said Josep Lluis Trapero, the regional police chief for Catalonia.”
Source: Spanish police link 120 gas canisters to suspected terrorist plot | News | DW | 20.08.2017