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The U.S. Attorney's letter

DETROIT, Michigan (CNN) -- The entire text of the letter, dated November 26, is as follows:

"As you may know, law enforcement officers and federal agents have been acquiring information that may be helpful in determining the persons responsible for the September 11th attacks on the World Trade Center and the Pentagon. Furthermore, they are pursuing all leads that may assist in preventing any further attacks. I am asking that you assist us in this important investigation.

"Your name was brought to our attention because, among other things, you came to Michigan on a visa from a country where there are groups that support, advocate, or finance international terrorism. We have no reason to believe that you are, in any way, associated with terrorist activities. Nevertheless, you may know something that could be helpful in our efforts. In fact, it is quite possible that you have information that may seem irrelevant to you but which may help us piece together this puzzle.

"Please contact my office to set up an interview at a location, date, and time that is convenient for you. During this interview, you will be asked questions that could reasonably assist in the efforts to learn about those who support, commit, or associate with persons who commit terrorism.

"While this interview is voluntary, it is crucial that the investigation be broad-based and thorough, and the interview is important to achieve that goal. We need to hear from you as soon as possible -- by December 4. Please call my office between 9 a.m. to 5 p.m. any day, including Saturday and Sunday. We will work with you to accommodate your schedule."

Yours truly,

Jeffrey Collins United States Attorney

Robert P. Cares Assistant United States Attorney