It casts a large shadow over the ongoing effort to understand what caused the collision of a passenger jet and a military helicopter ... according to Gary Steen, DC Fire and EMS assistant fire ...

An American Airlines regional jet went down in the Potomac River near Ronald Reagan Washington National Airport.

It casts a large shadow over the ongoing effort to understand what caused the collision of a passenger jet and a military helicopter last Wednesday as a new phase of the recovery started Monday.

The Bombardier CRJ700 regional jet and Black Hawk helicopter both crashed into the icy Potomac River after colliding midair.