The accused cult leader has been extradited to the United States and is set to be arraigned in Brooklyn, NY, later on Friday.

The 17-year-old Antioch High School shooter said before the attack he was acting on behalf of the group known as MKY.

Michail Chkhikvishvili, a Georgian national, has been extradited to the U.S., accused of inspiring "multiple senseless killings" around the world.