Two highly-regarded Russian figure skating coaches whose son recently finished fourth at the U.S. Figure Skating Championships were among those feared dead after an American Airlines flight collided with an Army helicopter and crashed into the frigid waters of the Potomac River Wednesday night.

The close-knit world of figure skating was in mourning on Thursday after a passenger jet carrying athletes and coaches, including former Russian world pairs champions Evgenia Shishkova and Vadim Naumov,

Figure skaters and their families and coaches were reportedly on board a flight that crashed near Washington, D.C., on Wednesday.