The Washington Monument, Lincoln Memorial and World War II Memorial were defaced by what authorities believe was a single vandal over Presidents Day weekend in Washington, D.C. Officials with the U.S. Park Police and National Park Service said that they believe a lone individual committed the criminal act late Saturday night with a permanent marker. "In the earliest hours of Sunday morning, around 1:00 or 2:00 am, a park police officer on patrol here at the Lincoln memorial discovered some graffiti," Sergeant Anna Rose, with the U.S. Park Police, said at a Tuesday morning press conference.