López initially intended to construct a bomb filled with hypodermic needles containing HIV-tainted blood, which satisfied his desire to have a lasting effect on Björk's life. When he realized it would not be feasible to build such a device, López began constructing a letter bomb using sulfuric acid in a hollowed-out book, which he planned to have sent to Björk's home in London, England. The device was designed to explode and kill or disfigure Björk as she opened the book. He would commit suicide after mailing the bomb, hoping that he and Björk would be united in heaven.
