The Islamic State group claimed on Tuesday its first attack on US soil, a shooting at an anti-Muslim event in Texas over the weekend showcasing cartoons mocking the Prophet Mohammed.
“Two of the soldiers of the caliphate executed an attack on an art exhibit in Garland, Texas, and this exhibit was portraying negative pictures of the Prophet Mohammed,” the jihadist group said.
“We tell America that what is coming will be even bigger and more bitter, and that you will see the soldiers of the Islamic State do terrible things,” the group announced.
Police said two men drove up to the conference centre Sunday in Garland, Texas, where the right-wing American Freedom Defense Initiative was organising the controversial cartoon contest, and began shooting at a security guard.
Garland police officers then shot and killed both men.
Simpson was being investigated by the FBI over alleged plans to travel to Somalia to wage holy war, court records show.
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Many Muslims find drawings of the prophet to be disrespectful or outright blasphemous, and such cartoons have been cited by Islamists as motivation in several previous attacks.