“But in his appearance on “Face the Nation,” he said emphatically that “at this point we agree with the British that it was designed to be detonated in flight.” The packages did not appear to need someone to “physically detonate them,” he said on CNN, indicating that a remote or automatic detonation was possible. Mr. Brennan said on “Meet the Press” that it was not clear whether those behind the attempted bombing had known, or could have known, whether the packages would be carried on cargo or passenger planes. Mr. Brennan said that authorities were not assuming that they had located all the packages involved in the attempted attack. The bombs were sophisticated and expertly constructed, American officials said Saturday, further evidence that Al Qaeda’s affiliate in Yemen is steadily improving its abilities to strike on American soil.”
— Bombs Were Designed to Destroy Planes, U.S. Believes - NYTimes.com