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(CNN) - Before authorities arrested him at O'Hare International Airport and accused him of attempting to provide aid to ISIS, a teen from the Chicago suburbs left behind a letter for his parents.
Mohammed Hamzah Khan, 19, wrote that he was leaving the United States and on the way to join ISIS, according to a criminal complaint. He invited his family to join him in the three-page letter, which authorities found in the bedroom he shared with a sibling in Bolingbrook, Illinois. But he warned them not to tell anyone about his travel plans, the complaint said.
"First and foremost, please make sure not to to tell the authorities," he wrote, according to the complaint. "For if this were to happen it will jeopardize not only the safety of us but our family as well."