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.

While authorities focus on the cause of the US's deadliest aviation disaster since 2001, families are mourning their loved ones. Here's the latest.

The American Airlines plane collided with a Blackhawk helicopter, near Reagan National Airport, just before 9 p.m. Wednesday.