"The killers were unbelievably careless," said Mustafa Alani, a security analyst at the Gulf Research Center in Dubai.

“杀手的粗心大意让人难以置信”迪拜海湾调查中心安全调查员Mustafa Alani说。

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The very fact that the eight people detained in Madrid stayed in one country Spain most of the time suggests that they cannot have played a central role in the network, according to Mustafa Alani, an associate of the Royal United Services Institute in London who has been studying al-Qaeda for many years.

ECONOMIST: The al-Qaeda network