The FBI has joined an investigation of a cyber attack on the International Monetary Fund's computer systems, a U.S. Defense Department spokeswoman said on Saturday night.

The FBI is working this with IMF, the spokeswoman, Lieutenant Colonel April Cunningham of the Air Force, said in an emailed reply to Reuters, referring to an active probe. The FBI, the government's main criminal investigative agency, did not immediately respond to a request for comment.

(Reporting by Jim Wolf and Jim Vicini; Editing by Peter Cooney)

Cybercrime International Monetary Fund