NPR's Tom Bowman and Joel Rose have both been following the investigation. They are both with me now. Joel, I'm going to let you kick us off. Federal safety investigators held a briefing today.

PFEIFFER: And Joel, with everything you've just told us, how close or how much closer are investigators getting to be able to say why this happened? ROSE: Investigators with the National ...

The warrant was signed by 19th Judicial District Judge Eboni Johnson Rose. Investigators sought “all financial and accounting records, together with any supporting documentation, associated with ...

Good morning. SIMON: And what is the latest on the investigation? ROSE: Investigators with the National Transportation Safety Board say they have recovered the black box from the helicopter.