An Arizona man was found guilty on Thursday of plotting with others to attack a “Draw Mohammed” cartoon contest in Texas last year and providing material support to the Islamic State group, prosecutors said.

Abdul Malik Abdul Kareem, 44, was convicted on all five charges against him by a federal jury in U.S. District Court in Phoenix stemming from the May 3 attack in the Dallas suburb of Garland that left his two alleged associates dead in a shoot-out with police.

The case against Kareem, also known as Decarus Thomas, was the first Islamic State-related prosecution to reach trial of the dozens brought by the federal government across the nation. It is the second jury verdict in such a case, as U.S. Air Force veteran Tairod Pugh was convicted earlier this month in New York.

“This verdict sends a strong message to those who support terrorists,” acting special agent in charge of the FBI’s Phoenix division, Justin Tolomeo, said in a statement.

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