Article: Attack on America -- 'Cells' Under Microscope -- Investigators ID four to five groups linked to bin Laden operating in United States

THE WASHINGTON POST

WASHINGTON - Four to five al Qaeda groups have operated in the United States for the last several years but investigators have not yet found any connection between them and any of the 19 hijackers responsible for the Sept. 11 attacks, according to government officials.

The groups, called "cells" by the FBI, are under intensive government surveillance. The FBI has not made any arrests because the group members entered the country legally in recent years and have not been involved in illegal activities since they arrived, the officials said.

Government officials say they don't know why the cells are here, what their purpose is or whether their members are planning attacks. ...

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