With only two days remaining before the Catalan government attempts to hold a suspended vote on secession from Spain, a burning object was thrown by two unknown suspects at the Civil Guard station in Igualada (Barcelona, Catalonia) on Thursday evening.

Earlier in the day, Civil Guard officers in the town seized 100 ballot boxes, 2.5 million ballot papers and four million envelopes related to the referendum.

Spanish newspapers rushed to headline that the object had been a "molotov cocktail"—a bottle containing a flammable liquid such as alcohol or petrol—but the Civil Guard told The Sp...