Days before an ISIS sympathizer attacked a cartoon contest in Garland, Texas, he received a text from an undercover FBI agent. Tear up Texas," the agent messaged Elton Simpson days before he opened fire at the Draw Muhammad event, according to an affidavit filed in federal court Thursday. "U know what happened in Paris," Simpson responded. "So that goes without saying ... No need to be direct." That revelation comes amidst a national debate about the use of undercover officers and human sources in terrorism cases. The texts were included in the indictment, released Thursday, of Erick Jamal Hendricks. He was charged with conspiring to provide material support to ISIS. [Hendricks] tried to recruit other Americans to form an ISIS cell on secret compounds and introduced an undercover agent to one of the Draw Muhammad attackers, according to the FBI. But Hendricks did more than make a connection. According to the court papers, he asked the undercover officer about the Draw Muhammad event's security, size, and police presence, during the event, according to an affidavit filed in court. FBI spokeswoman Carol Cratty hung up on The Daily Beast after being asked about the "tear up Texas" text. But shortly after that exchange, Simpson and his accomplice, Nadir Soofi, drove up to the contest and opened fire. Both men were killed in the altercation, but Hendricks would remain free for another year. Every major U.S. attack was linked to FBI investigation before it happened.