WASHINGTON, Oct. 29 (Kyodo) - By: Yoichi Kosukegawa (EDS: ADDING RUMSFELD'S COMMENTS) The U.S. administration issued a warning Monday against possible terrorist attacks over the next week amid news that more anthrax traces have been found at government facilities and a New Jersey woman has been diagnosed with the disease in first case not linked to postal workers or media organizations. "The administration has concluded, based on information developed, that there may be additional terrorist attacks within the United States and against the United States' interests over the next week," Attorney General John Ashcroft said at a news conference. "The administration views this information as credible, but unfortunately it does not contain specific information as to the type of attack or specific targets," he said. The alert is the second this month. The Federal Bureau of Investigation (FBI) issued a warning Oct. 11 that additional terrorist attacks could occur within days. President George W. Bush earlier in the day set up a task force to stop would-be terrorists from entering the U.S. by strengthening the enforcement of immigration policies. The creation of the Foreign Terrorist Tracking Task Force was decided at the first meeting of Bush's Homeland Security Council. "We welcome legal immigrants. We welcome people coming to America. We welcome the process that encourages people to come to our country to visit, to study or to work," Bush told reporters. "What we don't welcome are people who come to hurt the American people, and so therefore, we're going to be very diligent with our visas and observant with the behavior of people who come to this country," he said.