National Security Advisor Mike Waltz says at least 30 bodies have been recovered from plane crash site

A mid-air collision between an American Airlines jet and a US Army helicopter over the Potomac River resulted in no survivors among the 67 people involved. The National Transportation Safety Board (NTSB) is investigating the crash, which has shifted from a rescue to a recovery operation. The incident has led to the temporary closure of Reagan National Airport, with flights canceled or delayed. The news coverage includes updates from various correspondents and details on the Trump administration's response.

What is the role of the National Transportation Safety Board in this incident?

What was the weather condition like at the time of the crash?