Two Islamists were shot dead after attempting an attack on a free speech convention that included a competition to draw the Muslim prophet, Mohammed.
The thwarted attack took place Sunday night in Garland, Texas, a city north east of Dallas.
One of the suspects, identified as Elton Simpson, was place on probation in 2010 after being prosecuted for trying to join jihadist fighters in Africa.
Prior to the shooting a Twitter account, believed to be Simpson's tweeted out his wish to be seen as a soldier of Allah.
ABC News investigative reporter Brian Ross says the attack came after several calls by ISIS supporters on social media sites for American Muslims to target the event.
The Rebel's David Menzies was at the scene and filed an exclusive video report:
The winning image in the contest is highly relevant given the shooting was an attempt to shut down freedom of speech.
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