An American Airlines plane with 64 people on board collided with an Army helicopter over Washington, D.C., and crashed into the Potomac River.

At the end of his figure skating performance, when the last note of his parents’ favorite song played in an arena packed with spectators and heavy with sorrow, Maxim Naumov dropped to his knees at the center of the ice.

The Washington, D.C., event honored the 67 victims of the Jan. 29 crash, including six from the Skating Club of Boston.