"Asalam alaikum, brother," the suspected terrorist messaged.
He had talked about "jihad and shooting all the people all the time," but the time had come to act. Using an anonymous phone app, he revealed his plan to attack. "I cannot speak of anything," he said. "Say your dua, sleep, and watch the news tomorrow."
Within hours, law enforcement agents were outside his apparent. He tried furiously to encrypt his computer files, but it was too late.
The FBI arrested Garrett Grimsely and seized an assault weapon, along with about 340 rounds of ammunition. He is facing up to five years in prison for "transmitting a threat in interstate commerce to injure the person of another."