Ahmed Mohammed el-Gammal, a bespectacled suburban Phoenix man, did not immediately react as the jury foreman read the verdict yesterday to end the three-week trial.
In a statement, US Attorney Preet Bharara cheered the verdict.
"Once again, we have shown that terrorists and terrorist enablers can be brought to justice fairly, openly and swiftly in the crown jewel of our justice system civilian courts," Bharara said.
Trial evidence consisted largely of social media communications between el-Gammal, el-Goarany and others before and after el-Goarany traveled to Turkey in January 2015. He reached Syria days later.
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The trial was the first Islamic State group-related prosecution to occur in Manhattan federal court, which has had more than a dozen terrorism trials in the last quarter century in buildings located just blocks from the World Trade Center towers that were destroyed in 2001.
The 24-year-old Baruch College student's brother and father both admitted lying to the FBI. The family received a letter in November 2015 saying el-Goarany had been killed fighting for the Islamic State group.
Defense attorney Sabrina Shroff did not immediately comment on the verdict.
In a closing argument last week, she said el-Gammal was not guilty and that he did not know el-Goarany was joining the group. She said el-Goarany engineered his own fate as he looked for meaning in life to erase feelings of inadequacy.
He noted that el-Gammal deleted 300 pages of Facebook messages and 969 or 970 encrypted messages related to the plot after el-Goarany told him he had trained with the Islamic State group.
No sentencing date was set by US District Judge Edgardo Ramos. El-Gammal faces a mandatory minimum of 10 years in prison.
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