Transcript for U.S. Ambassador Christopher Stevens Killed in Libya
It was a chaotic and terrifying scene. 20 gun-wielding attackers, storming the american consulate in benghazi overnight. Nearly a dozen americans were inside, guarded only by libyan security. For nearly 20 minutes, the libyan guards exchanged fire with the attackers. And hurled a firebomb inside. The militants burned down at least one building. Ambassador stevens was either killed by smoke inhalation, or more likely in a car trying to escape with two guards, which may have been hit by a mortar. The other american was killed from smoke inhalation. Ambassador stevens is a long-serving diplomat. Widely respected and passionate about libya. He was there during the revolution, serving as the american representative to the transitional national council. Earlier in the day tuesday, protesters breached the walls of the u.S. Embassy in cairo, tearing down the american flag and ripping it to shreds. Raising a black flag reading, there is no god but allah. U.S. Officials fear both incidents are in response to this low-budget, anti-muslim film. It's so controversial in the middle east, abc news is not showing it. The movie was produced in the u.S. By an israeli filmmaker, who says he intented the film to be provocative and says islam is a cancer. What they want to do is make muslims mad. It seems like that occurs. We'll see if it spreads to other cities around the world. Reporter: Muslims say it insults the prophet mohammed, depicting him as a fraud and womanizer. Many blame america for the film. And it's being promoted by terry jones, the gainesville, florida, pastor, who angered the muslim world in 2010, when he threatened to burn the koran.
This transcript has been automatically generated and may not be 100% accurate.