The threat of nuclear terrorism is not limited to New York City or Washington, DC. While New York is widely seen as the most likely target, it is clear that Al Qaeda is not only capable but also interested in mounting attacks on other American cities, where people may be less prepared. Imagine the consequences of a 10-kiloton weapon exploding in San Francisco, Houston, Chicago, Los Angeles, Charlotte, or any other city Americans call home. From the epicenter of the blast to a distance of approximately one-third mile, every structure will be destroyed and no one would be left alive. A second circle of destruction extending three-quarters of a mile from ground zero would leave buildings looking like the Federal Office Building in Oklahoma City. A third circle reaching out 1 mile would be ravaged by fires and radiation.