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Barcelona van attack and Cambrils stabbing left 16 dead in 2017
One cell member cut short sentences to avoid raising suspicion in phone conversations tapped by secret services
Secret services were in touch with Abdelbaki Es Satty via email until August 17 incidents and knew about the cell's movements, according to ‘Público’ newspaper
Unanswered questions still surround the events, such as the relationship between Spain's intelligence service and the alleged mastermind