NEW YORK (AP) — YouTube has blocked a video attacking Islam’s prophet Muhammad in Egypt and Libya, where angry protests were sparked by outrage at the video.

Ultraconservative Muslims enflamed by the video stormed the U.S. embassy in Cairo on Tuesday and replaced an American flag with an Islamic banner. Later Tuesday evening, protesters in Libya burned down the U.S. consulate in the Libyan city of Benghazi, killing the U.S. ambassador to Libya and three members of his staff.