The anti-Muslim video made by the American. The one that spurred the attack. Common occurrence after anti-Muslim videos, cartoons etc.
What was perceived as denigrating of the Islamic prophet
Muhammad caused
demonstrations and violent protests against the video to break out on September 11 in Egypt and spread to other Arab and Muslim nations and to some western countries. The protests have led to hundreds of injuries and over 50 deaths.
[8][9][10][11]Fatwascalling for the harm the video's participants have been issued and a Pakistani minister has offered a bounty for the killing of Nakoula, the producer.
[12][13][14][15]
A two-minute excerpt dubbed in Arabic was broadcast on September 9 by
Sheikh Khalad Abdalla[69][70] on
Al-Nas, an Egyptian television station.
[71]
To Libyans who witnessed the assault and know the attackers, there is little doubt what occurred: a well-known group of local Islamist militants struck the United States Mission without any warning or protest, and they did it in retaliation for the video. That is what the fighters said at the time, speaking emotionally of their anger at the video without mentioning Al Qaeda, Osama bin Laden or the terrorist strikes of 11 years earlier. And it is an explanation that tracks with their history as members of a local militant group determined to protect Libya from Western influence.
http://www.nytimes.com/2012/10/16/w...shadow-nuances-of-benghazi-investigation.html
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However, the admin was saying it grew out of a peaceful protest, that was not true, it went straight to violence. Some of it had been previously planned, the video triggered it.