What is known about the collision between a passenger jet and Army helicopter near DC

A jet with 60 passengers and four crew members collided with an Army helicopter while approaching Ronald Reagan National Airport near Washington, D.C., sending the two aircraft plummeting into the Potomac River. Everyone on board the two aircraft is feared dead, officials said Thursday.

The collision occurred Wednesday night in some of the world’s most tightly controlled airspace, just over 3 miles (5 kilometers) south of the White House and the U.S. Capitol.

Here are some things to know about the collision: