The mastermind of last year's attacks in Barcelona and Cambrils, Ripoll imam Abdelbaki Es Satty, had four "police interviews" whilst in prison for drug trafficking. The first three were between April and June 2012, the last on 17th March 2014, a month before he left prison.
Late last year, reports emerged of some sort of relationship between Es Satty and the CNI, the Spanish security service. The director of the intelligence agency even ended up having to go to the Congress to explain the matter behind closed doors.
The "interviews" are mentioned in a report written by the prison service at the request of the judge investigating the attacks, Fernando Andreu, which Catalan news agency ACN had access to. The report includes the ID numbers of the officers involved.
Court documents also reveal that the cell bought the majority of their butane cylinders from other private individuals via Wallapop.