Forty-one sets of remains have been recovered and 28 of those victims have been positively identified, Washington, D.C., Fire and EMS Chief John Donnelly Sr. said at a news conference Friday. Next of kin notifications had been made to 18 families as of 6 a.m. Friday, he said.

On Saturday, officials are bringing salvage equipment to help remove the passenger plane and helicopter and retrieve the rest of the bodies.

As investigators try to uncover what happened when an airplane and a helicopter collided over the Potomac River, here is the latest information.