CAIRO — Protesters angry over an amateurish American-made video denouncing Islam attacked the United States Consulate in Benghazi, Libya, on Tuesday, killing a State Department officer, while Egyptian demonstrators stormed over the fortified walls of the United States Embassy here.

On the 11th anniversary of the terrorist attacks of Sept. 11, the assaults were a violent reminder that the changes sweeping the region have hardly dispelled the rage against the United States that still smolders in pockets around the Arab world.

The mobs were set off by Egyptian media reports about a 14-minute trailer for the video, called “Innocence of Muslims,” that was released on the Web. The trailer opens with scenes of Egyptian security forces standing idle as Muslims pillage and burn the homes of Egyptian Christians. Then it cuts to cartoonish scenes depicting the Prophet Muhammad as a child of uncertain parentage, a buffoon, a womanizer, a homosexual, a child molester and a greedy, bloodthirsty thug.

The trailer was uploaded to YouTube by Sam Bacile, whom The Wall Street Journal Web site identified as a 52-year old Israeli-American real estate developer in California. He told the Web site he had raised $5 million from 100 Jewish donors to make the film. “Islam is a cancer,” Mr. Bacile was quoted as saying.