By Julian Pecquet - 03/14/13 07:29 PM EDT
Al-Shibli was reportedly a member of an Islamist group that tried to overthrow Moamar Gadhafi in the 1990s. Gadhafi has accused him of participating in the murder of a German counterintelligence official and his wife 20 years ago.
The arrest comes as Republicans are renewing their probe into events leading up to the attack and its aftermath. Lawmakers told The Hill this week they are considering issuing subpoenas for State Department and CIA personnel wounded in the attack and holding up the nomination of President Obama's nominee to replace Stevens, Deborah Jones, if the administration does not let Congress interview them.