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Mr. Lamen, president of the American-Libyan Council, said his niece’s husband has not been heard from since he was detained in the city of Az Zawiyah.

Mr. Lamen said the regime is monitoring cellphone and Facebook activity, especially in parts of the country that are under its control. Phone connections in much of Libya remain erratic.

Atef Abd al-Qader Al-Atrash, a prominent blogger, was last seen at a gathering near Benghazi’s port on Feb. 17. He is thought to have been seized by forces loyal to Col. Gadhafi.

“We kept trying to call his phone but never got through, until some days later when a man who spoke with a [western Libyan] accent answered and said: ‘This is what happens to those who throw stones at us.’ But Atef had never even thrown stones,” a relative of Mr. al-Atrash told Amnesty International.

Malcolm Smart, Amnesty International’s director for the Middle East and North Africa, said there appears to be a “systematic policy to detain anyone suspected of opposition to Col. Gadhafi’s rule, hold them incommunicado, and transfer them to his strongholds in western Libya.”

“Given the circumstances of their enforced disappearance, there is every reason to believe that these individuals are at serious risk of torture and ill-treatment,” he added.

U.N. Security Council Resolution 1973, which imposed a no-fly zone over Libya, also authorizes the use of all means necessary to protect civilians in Libya.

The continued abduction and assault of civilians has friends and relatives fuming.

“What is the international community doing to protect civilians in Zintan, Az Zawiyah, Misurata,” said Mr. Abuzaakouk. “Innocent people are under attack.”