Just offshore of the towering national monuments of Washington, a tall crane now hovers over the Potomac River. It casts a large shadow over the effort to understand what caused the collision of a passenger jet and a military helicopter last Wednesday as a new phase of the recovery starts.

Crews are on the scene on the Potomac River to retrieve the submerged wreckage of an airliner and an Army helicopter that collided midair in the deadliest U.S. air disaster since 2001.

The Army Corps of Engineers is expected to begin removing wreckage following the deadly collision of an Army helicopter and a passenger plane.

Crews spent the weekend positioning cranes and other key equipment following last week's deadly plane crash near Washington, D.C.

Wreckage from the midair collision near Reagan National Airport is being removed Monday from the Potomac River as officials still look for 12 victims.

The US Army Corps of Engineers, alongside the Coast Guard and the Navy’s Supervisor of Salvage and Diving, will start clearing the wreckage from the deadly midair collision near Ronald Reagan Washington National Airport on Monday.