THE conspirators moved like ghosts: furtively, invisible, spreading terror and death. On Friday morning two weeks ago, bombs simultaneously ripped through the JW Marriott and Ritz-Carlton hotels, killing nine and wounding dozens.

The perpetrators used a unique method to carry out the deadly crime that Friday. In previous acts of terror—the Bali I and II, Marriott I and the Australian Embassy bombings—the perpetrators set up the bombs outsid