U.S. Department of Justice(NEW YORK) -- Federal authorities have arrested a man accused of detonating an explosive device outside the office of the Alabama attorney general in late February.Kyle Calvert, 26, of Irondale, Alabama, was arrested Wednesday on charges of malicious use of an explosive and possession of an unregistered destructive device, according to the Department of Justice.The device was set off on Feb. 24 at approximately 3:42 a.m. outside the Montgomery office of Alabama Attorney General Steve Marshall, authorities said. No one was injured and the contents of the exploded devic...