Protesters storm U.S. embassies

SANAA, Yemen -- American unrest escalated in the Middle East on Thursday as demonstrators burned U.S. flags in Yemen and protesters descended on the embassy in Cairo for a third straight day. Security was increased at American embassies and consulates around the world after a mob of Libyans attacked the U.S. consulate in the eastern city of Benghazi, killing American Ambassador Christopher Stevens and three other Americans. In Yemen's capital of Sanaa on Thursday morning, black smoke billowed into the sky from burning SUVs inside the U.S. Embassy compound. Hundreds of angry demonstrators tried to storm the building, chanting "death to America" and death for the American filmmaker who made an anti-Islam film that helped spark a deadly attack on the embassy in Libya and protests in Egypt.