31.   Federal prosecutors said they may soon seek a material witness warrant against Abdi, who was served Friday with a subpoena to appear before a federal grand jury.

32.   Federal investigators have aggressively used the material witness statute to hold people they believe have information that would help them prosecute suspected terrorists.

33.   Federal laws allow prosecutors to win court orders holding people as material witnesses to insure that their testimony is available.

34.   Four others have been arrested as material witnesses.

35.   He has been held as a material witness ever since, and now may face questions before the federal grand jury in the case.

36.   He is being held as a material witness in the bombing case.

37.   He is being held as a material witness in the investigation.

38.   He had been held since then as a material witness and on unrelated charges of making bombs in Michigan.

39.   He has since been held in Brooklyn as a material witness.

40.   He was arrested as a material witness two days later.