CAIRO – Young demonstrators in Cairo and Sana, Yemen, battled government security forces Thursday in anti-American protests over an online video made in the United States that mocks the Muslim prophet Muhammad.

In Yemen’s capital, at least four protesters were killed and more than 30 were injured, some of them severely, on the third consecutive day of protests across the Middle East.

Crowds broke into the U.S. Embassy compound in Sana, burning cars and looting offices before they were subdued by the Yemeni army. There were no reports of American injuries, unlike in Benghazi, Libya, on Tuesday night, where gunmen, in the midst of a street protest, stormed the U.S. Consulate and killed Ambassador J. Christopher Stevens and three other Americans.