Federal prosecutors in Brooklyn unsealed an indictment Wednesday charging Ibrahim Suleiman Adnan Adam Harun with six terrorism-related counts.

The announcement that Harun is in U.S. custody in New York may also shed light on a small part one of the most secretive aspects of U.S. counterterrorism operations during the Bush administration: What became of terror suspects held by the CIA in its network of “black-site” prisons around the world? Or disappeared into foreign cells in extraordinary renditions?

With their indictment of Harun, prosecutors offered a basic account of how the 43-year-old Nigerian – described as “a prototype Al Qaeda Operative” – spent the last decade. He fought U.S. forces in Afghanistan, prosecutors said, before leaving for Africa, where he allegedly conspired to bomb U.S. diplomatic facilities. Harun, also known by his alias Spin Ghul, eventually wound up in Libyan prison for six years before he was released amid the turmoil of the uprising against Muammar Qaddafi.

Did the U.S. know that he was in Libya, and did they play a role in his detention? Did the CIA work with the Libyans to then obtain information from him?

Testimony from an alleged former CIA detainee, a leaked document from the military prison at Guantanamo Bay, and evidence from cases of others rendered to Libya suggest that might be so.

A spokesman for the CIA said that the agency “does not, as a rule, comment on matters before the courts.” The U.S. Attorney’s office for the Eastern District of New York declined to provide information beyond what was announced with the indictment. A lawyer for Harun, David Stern, also declined to comment.

The CIA has steadfastly refused to comment on the fates of most former detainees, publicly accounting for only 16 people of the roughly 100 the agency has said it once held. The U.S. has successfully dismissed lawsuits over rendition and asserted that much about the CIA program is still classified.

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