All major components of the American Airlines jet and the Black Hawk helicopter that collided in midair on Jan. 29 have been removed from the Potomac River, authorities said Thursday evening.

The U.S. Coast Guard, the U.S. Army Corps of Engineers and others have spent the past four days salvaging the wreckage while aiding in recovery efforts, USACE Baltimore District Commander Col. Francis Pera said in a news release.

The midair collision between the American Airlines passenger plane and the military helicopter is the deadliest aviation incident in the United States since 2009. The Unified Command responding to the scene announced Wednesday all 67 victims were recovered and identified. More than a dozen of the passengers were Marylanders.

The wreckage will be transported to a secure location so the National Transportation Safety Board can examine it as part of their ongoing investigation, officials said. Salvage crews will continue to clear the river of smaller debris before demobilizing equipment by Feb. 16.

“We will continue pushing forward in the coming days until we are confident the river is safe for navigation and that elements of evidentiary value are recovered and provided to the appropriate authorities,” said Pera.