The pair were gunned down after shooting a security guard in the leg outside the Curtis Culwell Center in Garland, Texas, during the controversial event where caricatures of the Prophet Muhammad were being displayed.
The building and surrounding area was placed on lockdown by a SWAT team with around 100 attendees still inside after multiple gunshots were heard.
FBI bomb squad robots were then sent into the area to check the area for any additional devices as the two bodies lay on the road.
A contest offering a top prize of $10,000 for the best caricature of the prophet was being held as the shootout unfolded.
The event had been condemned by critics as an attack on Islam, but the organizers insisted they were simply practicing free speech.
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