Excerpt: “All major pieces the Mitsubishi Heavy Industries (MHI) RJ Aviation (Bombardier) CRJ700 and the Sikorsky UH-60 Black Hawk involved in the Jan. 29 mid-air collision near Ronald Reagan National Airport have now been recovered to a secure airport facility for further examination and documentation. Investigators will be looking for witness marks on the aircraft that could provide clues to the angle of collision. Teams also recovered the CRJ’s Traffic Collision Avoidance System (TCAS) and retrieved additional avionics from the Black Hawk. A National Oceanic and Atmospheric Administration TopoBathy lidar survey from a manned NOAA aircraft was conducted this morning and identified multiple underwater targets that could be additional aircraft debris. Divers investigated those targets today and will continue that work this week. “