The United States has added Web sites to its list of "foreign terrorist organizations" for the first time, under the category of aliases for conventional groups, a State Department official said Friday.

A list published in the Federal Register includes Newkach.org, Kahane.org, Kahane.net and Kahanetzadak.com as aliases for the Jewish group Kahane Chai, or Kach, which is suspected of organizing attacks on Palestinians.

Under U.S. law, it would be illegal to provide money or other material support to the designated Web sites, the people who run them could be denied U.S. visas, and U.S. banks must block their funds. The State Department said it was not yet clear how this would work in practice.

But the law may not enable the United States to block access to the Web sites, if only for technical reasons.

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