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Fast-moving computer worm Tuesday attacked computer systems using Microsoft operating systems, shutting down computers in the United States, Germany and Asia. Among those hit were offices on Capitol Hill, which is in the midst of August recess, and media organizations, including CNN, ABC and The New York Times. Caterpillar Inc. , in Peoria, Illinois, reportedly also had problems. A small number of computers in an administrative office at San Francisco International Airport also crashed, but they were not essential to the airport’s operation, spokesman Mike McCarron said. The FBI said the computer problems did not appear to be part of any widespread attack.