In the three years before the deadly collision between an Army helicopter and an American Airlines flight near Reagan National Airport, at least two other pilots reported near-misses with helicopters while landing at the airport,

The crash disrupted flights at Reagan National Airport. Several dozen emergency crews could be seen at the scene of the crash, apparently just south of Reagan National Airport’s upper departure area,

The report, reviewed by The New York Times, said that one controller was communicating with both helicopters and planes. Those jobs are typically assigned to two people, not one.

The National Transportation Safety Board has begun an investigation into the deadly mid-air collision between an American Eagle regional jet and a military helicopter that left all 67 people onboard the aircrafts dead.

At least one aircraft crashed Wednesday evening over the Potomac River near Ronald Reagan International Airport outside Washington, D.C., officials said, grounding all flights at the airport. The District of Columbia Fire and Emergency Medical Services Department reported in a social media post that a small aircraft crashed in the Potomac River in the "vicinity" of the airport.

Ronald Reagan Washington National Airport is known for its close proximity to Washington, D.C., but after its first deadly plane crash in more than four decades, several of the airport’s difficulties are under scrutiny.