TUNIS, Tunisia —After months of asking, agents from the FBI questioned the only known suspect in the Sept. 11 attack on the U.S. consulate in Benghazi that killed four diplomats, the suspect’s Tunisian lawyer said Saturday.

Ali Harzi, a Tunisian, was detained in Turkey and extradited to Tunisia in October where authorities have said he is “strongly suspected” of being involved in the attack.

His lawyer, Anwar Oued-Ali, added that Harzi also was questioned about an attack on the U.S. embassy in Tunisia, a few days later, suggesting the American authorities are looking into if there is a connection between the two attacks.