James T. Booker , 20 , of Topeka , Kansas , was arrested following Facebook post sting . His plan to join Army was stopped last year after extremist FBI . He faces terrorism charges , including using a weapon of mass destruction . Booker arrested outside Fort Riley 's supposed 'secret gate ' with car bomb . Imam says that suspect was mentally ill. Alexander Blair , 28 , arrested for failing to inform authorities about plan .
James T. Booker , 20 , of Topeka , Kansas , was arrested following FBI sting . His plan to join Army was stopped last year after extremist Facebook post . He faces terrorism charges , including using a weapon of mass destruction . Booker arrested outside Fort Riley 's supposed 'secret gate ' with car bomb . Imam says that suspect was mentally ill. Alexander Blair , 28 , arrested for failing to inform authorities about plan .