Consider how a city looks to a terrorist seeking targets. There's the airport — inviting, but heavily secured. There's the U.S. Embassy, perimeter guarded by crack local forces and Marines. And there's the plush international hotel, open to anyone with a decent outfit and money for a cup of coffee. Across the world, the finest hotels draw foreign businessmen, droves of tourists, and local movers and shakers who crowd the restaurants and bars to see and be seen. There are society weddings, banquets and even "Sweet Sixteen" birthday parties for the daughters of the well-to-do. In places where Western-style amenities are rare, international hotels are often the most vital connection to the rest of the world. Their business model demands openness and accessibility for visitors and guests, making total security virtually impossible despite security barriers, metal detectors and high-tech surveillance gear.

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