The two macro factors that could derail this scenario are some sort of terrorist event that completely undermines investor confidence across all sectors, or an unexpected downturn in the economy.

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That issue will be addressed at another meeting in November, but IOC officials believe that the risk of a terrorist event in Athens is no greater than in other cities which have hosted the Olympics.

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TRIA, which offers a backstop to private insurers in the event of a terrorist incident on American soil.

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The lease reportedly contained a provision letting Silverstein off the hook for rent in the event of a terrorist attack, with control reverting to the Port Authority.

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There is opposition from those who insist this is a private-sector matter, but insurers retort that they would still incur big losses in the event of a terrorist attack.

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Bush noted that his new budget nearly doubles spending for homeland security, including money for equipment and training for state and local police, firefighters and rescue workers who would be first on the scene in the event of another terrorist attack.

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