Defense Secretary Pete Hegseth announced that the Pentagon and the US Army have launched an investigation into the catastrophic midair collision between a commercial jet and a military helicopter near Ronald Reagan Washington National Airport on Wednesday night.

According to Secretary of Defense Pete Hegseth, the Army helicopter was on an "annual proficiency training flight" and the three soldiers on board had night vision goggles.

Military spokesman Ron McLendon II said the Army is joining an investigation into the crash headed by the National Transportation Security Board.

Defense Secretary Pete Hegseth said Thursday that “there was some sort of elevation issue” with the Army Black Hawk helicopter that collided in mid-air with a passenger airliner Wednesday night over the Potomac River that is now being investigated.

Officials believe there are no survivors after a passenger plane on approach to Reagan National Airport near Washington, DC, collided Wednesday night with a US Army helicopter midair, sending both aircraft into the Potomac River below,

The Army Black Hawk helicopter that collided with an American Airlines commuter plane near Reagan Washington National Airport in Virginia Wednesday was on a “training flight” when it crashed into the Potomac River, according to the military service branch.

Defense Secretary Pete Hegseth announced the Pentagon has begun a probe into the cause of a deadly midair collision between a passenger jet and a military helicopter, looking to understand who was to blame and how the tragedy occurred.

U.S. politicians expressed grief and sympathy on Wednesday night after a passenger plane from Kansas collided with a military helicopter near Reagan National Airport.

The Blackhawk that struck an American Airlines flight landing at Reagan airport had three soldiers on board and no VIPs or senior officials were involved.

An Army Black Hawk helicopter collided with a regional jet near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.

An American Airlines regional jet went down in the Potomac River near Ronald Reagan Washington National Airport after colliding with a U.S. Army Black Hawk helicopter, Wednesday night, prompting a multi-agency search-and-rescue operation, according to officials.

The Federal Aviation Authority has confirmed US Army Blackhawk helicopter and an American Airlines passenger plane were involved in a mid-air collision.