Libya Arrests 50 after U.S. Envoy's Killing

Libyan authorities have arrested at least 50 people in the wake of last week's killing of U.S. Ambassador Chris Stevens in a mob attack in the city of Benghazi, Libya's parliament chief said Sunday.

"The number reached about 50," Mohammed al-Megaryef, president of the Libyan National Congress, told CBS News in an interview.

Stevens and and three other Americans were killed on Tuesday when suspected Islamic militants fired on the U.S. consulate in the eastern Libyan city with rocket-propelled grenades and set it ablaze.

Megaryef said "a few" of those who joined in the attack were foreigners, who had entered Libya "from different directions, some of them definitely from Mali and Algeria."

"The others are affiliates and maybe sympathizers," he added.