The terrorist attacks on 9/11 succeeded because US intelligence failed to bring the various pieces of information together to prevent them. The attempted terrorist attack on a North West Airlines plane headed for Detroit almost succeeded because US intelligence failed to bring different pieces of information together that would have prevented the bomber getting on the plane.
Between 2001 and today, the US has spent around $40 billion on counter terrorist improvements and even more on trying to improve intelligence. And yet, nothing much seems to have changed.
In the current case, there was intelligence that the Yemen branch of Al Qaeda was using a ‘Nigerian’ as a bomber. There was information from the bomber’s own father that had been provided to the US embassy in Lagos that his son was a would-be terrorist. There were intercepts from the National Security Agency that suggested an attack was imminent.

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