D.C. plane crash cause still unclear as more bodies, evidence recovered – National [Video]

Police boats combed the banks of the Potomac River on Friday, slowly scanning the shoreline in the rain as investigators sought clues into the midair collision that killed 67 people and raised questions about air traffic safety around the nation’s capital.

Investigators announced that the black box from the Army Black Hawk helicopter that collided with a commercial jetliner has been recovered. They are reviewing the flight data recorder along with two from the plane as they probe the cause of the devastating crash.

No one survived the Wednesday night collision. The remains of 41 people had been pulled from the river as of Friday afternoon, including 28 that had been positively identified, Washington, D.C., Fire Chief John Donnelly Sr. said at a news conference. He said next of kin notifications had been made to 18 families, and that he expects the remains of all 67 people who died to eventually be recovered.

The wreckage of the plane’s fuselage will probably …