Just after midnight on Wednesday, Enric Hernández, the editor of El Periódico, announced on Twitter that his newspaper had published an exclusive story: the CIA had sent the Catalan police, the Mossos, a warning about an upcoming terror attack in La Rambla, the same Barcelona street that was attacked on August 17.

The US intelligence alert, according to [the story][story], was sent out by the National Counterterrorism Center on Thursday, May 25, and the list of recipients included not only the Mossos but also the Spanish National Police, the Civil Guard, the Spanish intelligence service ...