Libyan authorities arrested at least 50 suspects in connection with the killing of US Ambassador to Libya Chris Stevens in Benghazi last week, Libya's parliament chief said Sunday, according to AFP.

Mohammed al-Megaryef, president of the Libyan National Congress said a few of the attackers were foreigners, who entered Libya from countries including Mali and Algiera, AFP reported.

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"The others are affiliates and maybe sympathizers," AFP, quoted Megaryef as saying.