The FBI has long been worried about the vulnerability of the nation's rail system to terror attack. But the threat was deemed immediate enough late last week for the agency to issue a formal warning. The alert cautioned that al-Qaeda, "possibly using operatives who have a Western appearance," might try to destroy key rail bridges, derail trains or target hazardous-material containers. What prompted the unusually specific warning? Intelligence sources tell TIME it came as a result of the attack by two gunmen who killed one U.S. Marine and wounded another on a Kuwaiti island on Oct. 8. Kuwaiti authorities who afterward...
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