Aaron Greene , 31 , was arrested by police on December 29 . He was initially charged with possession of an explosive substance . He allegedly told police `` he had given them to a friend in law enforcement , '' Browne said . Police say they have evidence that Greene allegedly wanted to target a monument . He allegedly told police he wanted to blow up the Washington Memorial Arch , police said .
Aaron Greene , 31 , was arrested by police on December 29 . He was initially charged with possession of an explosive substance . Police say they have evidence that Greene allegedly wanted to target a monument . He allegedly told police he wanted to blow up the Washington Memorial Arch , police said .