>> and i'm christine romans. a naturalized american citizen is in custody with providing support to terrorists. we have cnn's ian perez with the latest. >> reporter: the alleged terrorist threat that officials have warned us about for months. an american traveled overseas to fight with an al qaeda group to plot an attack at home. a federal indictment charges the resident of columbus ohio with attempting to provide support to the terrorist group. mohamud became a u.s. citizen last year. he flew on a one way ticket to greece with plans to turkey and syria. he got training in guns and explosives. he came back in june days after