WASHINGTON - Authorities in Tunisia have agreed to allow FBI investigators access to a detained Islamic militant suspected of playing a role in the September 11 attacks on US diplomatic facilities in Benghazi, Libya, US officials said on Friday.

Under an arrangement worked out between Tunisian and US officials, American investigators will be allowed to interview Ali Ani al Harzi under the supervision of Tunisian officials.

The arrangement was first made public in a written statement issued on Friday by two Republican US senators, Saxby Chambliss, vice chairman of the Senate Intelligence Committee, and Lindsey Graham, a senior member of the Senate Armed Services Committee.

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