HOUSTON , May 5 (Xinhua) -- The Islamic State terrorist group on Tuesday claimed responsibility for the attack on a controversial cartoon contest that left two gunmen dead in northern U.S. state of Texas Sunday night.
In a broadcast on its radio channel al-Bayan, the Islamic State of Iraq and the Levant (ISIL), or the Islamic State of Iraq and Syria (ISIS), or simply as the Islamic State, allegedly declared that "two soldiers of the caliphate" carried out the shooting outside a school arena in Garland , a Dallas suburb, where a contest for cartoons depicting the Prophet Muhammad was being held.
"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 said in its statement.
Authorities cannot confirm if the gunmen were directly linked to the terror group. ISIS and other terror groups often take credit for attacks in which they were not involved to bolster their propaganda.