PARIS (AP) - Intelligence agencies that have succeeded in thwarting many of al-Qaida's plans for spectacular attacks are struggling to combat the terror network's strategy of encouraging followers to keep to themselves, use off-the-shelf weapons and strike when they see an opportunity. In recent weeks - at the Boston Marathon, in the streets of London and in the shadow of one of Paris' most recognizable monuments - young men allegedly carried out attacks with little help, using inexpensive, widely available knives and explosives from everyday ingredients. In each of the attacks, suspects had previously been flagged to law enforcement and deemed not to be a priority.
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