A Florida man who piloted a gyrocopter through miles of America's most restricted airspace before landing at the U.S. Capitol is now facing charges that carry up to 9½ years in prison.

The U.S. attorney's office for the District of Columbia said Wednesday in a statement that a grand jury has indicted Douglas Hughes on six charges. He is scheduled to appear Thursday in federal court in Washington.

Hughes, who took off from Gettysburg, Pennsylvania, was arrested April 15 after he landed on the Capitol's West Lawn. Hughes has said his flight was intended to call attention to the influence of big money in politics. The stunt also led to a congressional hearing and exposed a gap in ensuring the safety of buildings in the city.