Four members of a Prince George's County-based labor union were onboard a plane that collided with an Army helicopter Wednesday in Washington D.C., and are now presumed dead, union leaders said in a social media post.

Two teenage figure skaters, their coaches and family members among 14 members of U.S. figure skating community in deadly plane crash over D.C. airport.

A pair of 16-year-old skaters, their mothers, and two Russian coaches were among the passengers on board an aeroplane that hit a helicopter above Washington DC on Wednesday evening, the group's skating club in Boston says.