It was the first Atlantic hurricane of the season, and the first to hit the mainland United States in two years.

© Zack Wittman for The New York Times

Many people in the storm’s path escaped the worst, but 4 people were killed and there was plenty of damage.

© Zack Wittman for The New York Times

Law enforcement officials had said that Christopher Gillum, a former police officer in North Carolina, planned to attack a large festival. He was released without charges.

© Sophia Germer/The Times-Picayune, via The New Orleans Advocate, via Associated Press

Christopher Gillum had targeted a large festival there, the authorities said. He was arrested on Wednesday in a Florida hotel room before he could carry out his plans.