ISIS militants claimed responsibility at the Prophet Muhammad cartoon contest in Dallas, TX. Photo: Screenshot, Fox News Sunday.

JNS.org – The Islamic State terror group claimed responsibility for the shooting attack at a free speech event in Texas on Sunday night that featured cartoons of the Prophet Muhammad, marking the first time the group has admitted to carrying out an attack on U.S. soil.

“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 Muhammad,” Islamic State said in a statement broadcast on its official radio station.

“We tell America that what is coming will be even bigger and more bitter, and that you will see the soldiers of ISIS (Islamic State) do terrible things,” the group added.

On Sunday, two gunmen opened fire at an event hosted by the American Freedom Defense Initiative called “Jihad Watch Muhammad Art Exhibit and Cartoon Contest,” in Garland, Texas. One security guard was wounded, and the gunmen were subsequently killed by police officers.

The FBI identified one of the gunmen as Elton Simpson from Phoenix. Simpson was previously charged in 2010 by federal prosecutors for attempting to travel to Somalia “for the purpose of engaging in violent jihad.” The other gunmen is reportedly from the same apartment complex in Phoenix, but investigators have not yet released his identity.