The Islamic State claimed responsibility on Tuesday for an attack outside a Texas art show, calling the gunmen two of its soldiers.
The IS said the attack outside a Prophet Muhammad cartoon contest was the work of two Al Khilafa soldiers.
IS claimed responsibility for the attack via a broadcast on its official radio channel and warned of more attacks to come.
Al Khilafa is how IS refers to its soldiers. The organization is also known as Daesh, ISIS or ISIL.
The two gunmen, Elton Simpson and Nadir Soofi, wounded a security guard before being shot and killed by police. The IS called Simpson and Soofi “brothers”
“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 statement released by the group said.
Experts said this could be the first time the IS has claimed to carry out an attack on U.S. soil.
There is no indication the IS in Iraq and Syria actually contacted the two gunmen, who both lived in Phoenix.
The report from the IS has not been independently confirmed.
Simpson, 30, one of the two gunmen fatally shot Sunday after allegedly opening fire outside the cartoon contest, was linked to a 2011 terror probe.
Garland Police said the two men drove up to the Curtis Culwell Center just before 7 p.m., where a “Muhammad Art Exhibit and Contest” was taking place. The gunmen got out of the car and shot a security guard in the ankle before they were shot and killed by police.
The security guard, 62-year-old Bruce Joiner, was taken to the hospital and later released.
Police detonated their own explosives in the suspects’ car out of concern there might be an “incendiary device” in it. A SWAT team evacuated the center as well as nearby businesses.