Ahmed Abu Khatallah, the suspect U.S. special forces captured earlier in June for his role in the attack, was flown via helicopter from the USS New York to Washington D.C. He had been held and interrogated by American special forces on the warship, according The New York Times.
Khatallah arrived Saturday morning, according to CNN.
The FBI also tweeted Khatallah's arrival on Saturday.
Ahmed Abu Khatallah arrived in D.C. today to face prosecution for his alleged role in the Sept. 2012 terrorist attacks in #Benghazi, Libya
— FBI (@FBI) June 28, 2014
Khatallah is one of the senior leaders of Ansar al Sharia, a militia whose members have been involved in a number of attacks on U.S facilities in Benghazi, according to CNN.
Khatallah has said he was motivated to participate in the attack by an anti-Islam video made in the U.S.
This story was updated.