Fox News has learned exclusively that an arrest has been made in connection with the Sept. 11, 2012 attack that killed four Americans in Benghazi, Libya.

"I can confirm that on Sunday, June 15 the U.S. Military -- in cooperation with law enforcement personnel -- captured Ahmed Abu Khatallah, a key figure in the attacks on U.S. facilities in Benghazi, Libya, in September 2012. He is in U.S. custody in a secure location outside of Libya. There were no civilian casualties related to this operation, and all U.S. personnel involved in the operation have safely departed Libya," Pentagon Press Secretary Rear Admiral John Kirby said in a statement.

Jennifer Griffin reported from the Pentagon moments after the news broke. She noted that Khatallah gave an interview to the New York Times a month after the attack and has been known to U.S. authorities for a long time.

She also noted that Khatallah appears on multiple videos of the Benghazi attack, appearing to be giving orders to the attackers.

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A suspected terrorist linked to the 2012 Benghazi terror attack that killed four Americans has been captured inside Libya by U.S. forces and currently is en route to the United States, Fox News has learned exclusively.

Sources tell Fox News that the suspect, Ansar al-Sharia commander Abu Khattala, was captured Sunday during a joint U.S. military and law enforcement operation, and will face prosecution in the United States. 

President Obama signed off on the mission on Friday night, Fox News is told. He was captured south of Benghazi by U.S. special operators and is on his way to the U.S. aboard a Navy ship. 

Khattala was long thought to be one of the ringleaders of the deadly attack, in which U.S. Ambassador Chris Stevens and three other Americans died. He had openly granted media interviews since the 2012 attack, but until now evaded capture. 

 "He didn't know what hit him," one source told Fox News of the weekend capture. According to sources, there was no firefight -- a small Special Forces team with one FBI agent took part in the mission.