The F.B.I. said the shooting, which wounded two other people at the university, in Norfolk, Va., was being investigated as an act of terrorism.

Treasury Secretary Scott Bessent said it was “unfortunate” that the move could benefit Russia, but maintained that it was only for the short term.

Lawyers for a woman who has sued Mr. Cosby, accusing him of sexual assault, called Ms. Constand as a witness in the case, which is now being tried in California.