A gyrocopter rests April 15 on the west lawn of the U.S. Capitol in Washington. Doug Hughes, a 61-year-old postal worker from Ruskin, Fla., landed the lightweight helicopter on the Capitol lawn to promote campaign finance reform. He's scheduled to enter pleas to multiple charges Thursday. Chip Somodevilla/Getty Images hide caption

toggle caption Chip Somodevilla/Getty Images

Members of law enforcement and emergency services gather and a perimeter created around the west front of the U.S. Capitol as the U.S. Capitol was on lockdown Saturday after an apparent suicide. Carolyn Kaster/AP hide caption

toggle caption Carolyn Kaster/AP