TRIPOLI - The top US counter-terrorism adviser will visit Libya on Tuesday to discuss the investigation into the killing of the US ambassador at the US consulate in Benghazi last month, a Libyan protocol official said.

John Brennan, the senior White House adviser on counter-terrorism, will meet with the president of the national congress, Mohammed Magarief, as well as army, intelligence, interior and foreign ministry officials, said the official, who declined to be named.

US ambassador Chris Stevens was killed along with three other Americans on September 11 in an attack on the consulate in Benghazi.

American FBI agents travelled to the Libyan capital Tripoli a few days after the attack to join in the investigation, but domestic political upheavals and disagreement over the terms of the cooperation held up a visit to Benghazi for over two weeks.

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