A third Florida man is set to plead guilty in an FBI terrorism sting involving a plot to travel to Syria and fight with the Islamic State extremist group.

Court records filed Monday show a plea agreement has been reached between federal prosecutors and 54-year-old Gregory Hubbard of West Palm Beach. A change of plea hearing is set for next week.

Hubbard previously pleaded not guilty to conspiracy, attempting to provide support to a foreign terrorist organization and selling ammunition to a felon. Details of his plea agreement have not been made public.

Two other men previously pleaded guilty and are awaiting sentencing.

The case became complicated when the FBI's main informant admitting committing fraud while working with the government. He is serving a two-year prison sentence.