"We have taken a serious look at that information, and at this point we do not know of a credible threat," Justice Department spokeswoman Mindy Tucker said.

Attorney General John Ashcroft and other law enforcement officials have cautioned in recent days, however, that the threat of violence is not over. They say that people connected to the terrorist network responsible for last week's attacks may remain in the United States.

"We will take every possible action to make sure that this kind of injury and assault on America and on its freedom does not happen again," Mr. Ashcroft said Wednesday after he toured devastation at the Pentagon.

As of Wednesday afternoon, 115 people detained for questioning remained in custody, held on immigration violations. That list of detainees is growing as FBI agents find more people on the list of about 200 people wanted for questioning.

While some may be associates of the hijackers, others may have information relevant to the investigation, Justice Department officials say.

No criminal charges have been filed in direct connection with the attacks on the World Trade Center and Pentagon, Ms. Tucker said.

A criminal complaint was filed against three Detroit men Tuesday, charging them with having fraudulent identification uncovered when their apartment was searched in connection with the investigation.

A day planner found in the apartment contained notations in Arabic referring to the "American base in Turkey" and "the American foreign minister" as well as airport runway diagrams, the FBI said in an affidavit.

Federal law enforcement officials refused to speculate on how the information found in the Detroit apartment may be relevant to the investigation.

Banking authorities are helping the FBI track the money trail leading to the 19 hijackers and their associates. A list of 21 possible suspects, including most of the 19 men identified as the hijackers and a few others sought by the FBI, was circulated by banking regulators Wednesday to financial institutions nationwide.

The alert by the Federal Deposit Insurance Corp. asks banks to research any accounts or financial transactions made in the suspects' names and provide that information to the FBI.

Federal computer experts are conducting forensic examinations of dozens of computers seized nationwide, some of which the hijackers are suspected of using, tracing their e-mail and Internet footprints.

Terrorist networks such as those responsible for unleashing last week's attacks receive the support and protection of "a variety" of foreign governments, the attorney general said.

"It's time for those governments to understand with crystal clarity that the United States of America will not tolerate that kind of support for networks that would inflict this kind of damage on the American people," Mr. Ashcroft said during his Pentagon tour.

He declined to identify those countries, saying: "I think the statement speaks for itself."

Intelligence and law enforcement officials have been poring over a possible link between the suicide hijacker identified as Mohamed Atta and Iraq. Mr. Atta met with an Iraqi intelligence official in Europe recently, according to information provided to the U.S. government by a foreign intelligence service.

No "confirmed evidence" exists at this point of a link between the hijackers and any foreign government, Ms. Tucker said.

The Bush administration intends to send Congress this week a sweeping legislative proposal that would grant federal law enforcement major new wiretapping and surveillance powers, while making key changes to national immigration law.

Mr. Ashcroft met Wednesday with key congressional leaders to urge swift passage.

"We're grateful that the Hill has been so supportive," Ms. Tucker said.