An airspace cluttered with passenger planes and military aircraft. A history of near-crashes. And a growing shortage of air traffic controllers available to manage it all. Some experts, politicians and airport managers have been warning for years of the risks posed by the crowded airspace and volume of flights at Ronald Reagan Washington National Airport (DCA).

U.S. authorities said on Thursday it was not yet clear why a regional jet crashed into a U.S. Army helicopter at a Washington airport, killing 67 people in the deadliest U.S. air disaster in more than 20 years.

The Associated Press is providing live video of the scene of the plane crash near Washington’s Reagan Airport:

The airspace around Ronald Reagan Washington National Airport has long been problematic due to heavy military and commercial flight activity in the nation’s capital, according to industry insiders.

Ronald Reagan Washington National Airport (DCA) services both military helicopters and passenger planes every day.

South Holland police ultimately had to clear out trustees, neighbors, and the news media after allies and critics of Thornton Township Supervisor Tiffany Henyard let their fists speak for them.

WASHINGTON D.C., DC — Multiple Texas representatives have released statements Wednesday night after a plane collided with a military helicopter, causing it to crash near the Ronald Reagan Washington National airport. Ronald Reagan Washington National airport has closed all runways, and stopped air traffic in the area.

According to the Patrick Leahy Burlington International Airport website, three American Airlines flights between DCA and BTV were canceled for Wednesday night and Thursday morning.

Despite the deadly midair collision near Ronald Reagan Washington National Airport in Washington D.C., scores of people were lined up at the Alaska Airlines bag drop gates at Seattle-Tacoma International Airport (SEA) this morning,

The White Marlin Open says the fisherman was among those who lost their loves in the collision at Ronald Reagan Washington National Airport.

On Tuesday, a day before Wednesday’s fatal collision, a Republic Airways jet from Windsor Locks, Conn., was minutes away from landing at Ronald Reagan Washington National Airport before it aborted its landing to avoid a helicopter in its way.