BENGHAZI, Libya -- Hundreds of protesters angry over last week's killing of the U.S. ambassador to Libya stormed the compound of the Islamic extremist militia suspected in the attack, evicting militiamen and setting fire to their building Friday.

In an unprecedented show of public anger at Libya's rampant militias, the crowd overwhelmed the compound of the Ansar al-Shariah Brigade in the center of the eastern city of Benghazi.

Ansar al-Shariah fighters initially fired in the air to disperse the crowd, but eventually abandoned the site with their weapons and vehicles after it was overrun by waves of protesters.

No deaths were reported in the incident, which came after tens of thousands marched in Benghazi against armed militias. One vehicle was also burned at the compound.

Earlier Friday, some 30,000 people filled a broad boulevard as they marched along a lake in central Benghazi to the gates of the headquarters of Ansar al-Shariah.

They carried banners and signs demanding that militias disband and that the government build up police. Other signs mourned the killing of U.S. Ambassador Chris Stevens, reading, "The ambassador was Libya's friend" and "Libya lost a friend."

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