Faraj al Chalabi, an al Qaeda terrorist also linked to the 1994 terrorist murder of two German tourists, was detained by the Tripoli government in March, according to the report.
However, al Chalabi was released June 12 based on claims that there was a lack of evidence to hold him custody.
The FBI is conducting an investigation into the Benghazi attack, which resulted in the murder of U.S. Ambassador Christopher Stevens and three other Americans.
Chalabi, who was arrested by the Libyans in March after returning from Pakistan, is believed by U.S. intelligence and law enforcement officials to be one of the people who organized the attack on the diplomatic compound, the Free Beacon reported.
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