The FBI has confirmed one of its translators travelled to Syria and secretly wed an Islamic State recruiter whom she had been investigating.
The FBI “took several steps in a variety of areas to identify and reduce security vulnerabilities” after the incident, the agency told BBC News.
Daniela Greene lied to her employers about her 2014 trip, reports CNN, which broke the story.
The 38-year-old served two years in prison after fleeing back to the US.
Greene’s story was ordered to be kept secret by a US judge, but was revealed for the first time on Monday after federal court records were unsealed.
The man whom Greene married, Denis Cuspert, is a German rapper-turned-IS recruiter.
In February 2015, the US government labelled him a “Specially Designated Global Terrorist”.
In one propaganda video he was seen holding a freshly decapitated human head.
Greene, who worked at the FBI’s Detroit field office, was tasked in January 2014 with investigating Cuspert, according to CNN.
Six months later the German-speaking linguist travelled to Syria to marry him.
Greene told her work superiors she was planning a trip to visit her parents in Germany.