Barcelona (CNN)The perpetrators of the terror attacks in Barcelona and Cambrils originally planned to use explosive devices to wreak greater devastation but were apparently thwarted because their materials detonated prematurely, police said Friday.

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CNN’s Eliza Mackintosh reported from Barcelona, while Ben Westcott wrote from Hong Kong and Laura Smith-Spark from London. CNN’s Vasco Cotovio, Isa Soares, Hilary McGann, Madalena Araujo, Claudia Rebaza, Livia Borghese, Katie Polglase and Nanlin Fang contributed to this report.