Tunisia's new prime minister says there is no evidence to link a Tunisian to the September attack on a U.S. diplomatic mission in Libya that killed the American ambassador and three others.

Prime Minister Ali Larayedh told The Associated Press: "May the party who has proof step forward."

Tunisian authorities said last year that they "strongly suspected" that the Tunisian, Ali Harzi, 28, was linked to the Sept. 11 Benghazi attack that killed U.S. Ambassador Christopher Stevens.

He was arrested in Turkey and extradited to Tunisia in October. But a judge released him in January for lack of evidence.

Larayedh also said Wednesday that U.S.-Tunisian relations are "excellent" even after a separate September attack on the U.S. Embassy in Tunisia by radicals who set fire to part of that facility.