Federal investigators are examining why an Amazon cargo jet overran a runway at Miami International Airport on Sunday, crossed a road and struck vehicles, killing at least five people and seriously injuring others.
The Boeing 767-300, operated by North Carolina-based 21 Air, crashed shortly before 14:00 after arriving from San Juan, Puerto Rico.
Officials have not identified the victims or confirmed whether those killed were aboard the aircraft, on the ground, or both.
The National Transportation Safety Board sent a team led by Chairwoman Jennifer Homendy to Miami and was expected to provide its first briefing on Monday.
Investigators are likely to examine where the aircraft touched down, along with its speed, braking performance, mechanical condition, weather and wind conditions.
Video of the landing appears to show the aircraft remaining airborne well down the runway before touching down, raising questions about whether it landed beyond the normal touchdown zone.
Flight-tracking site Flightradar24 reported that the aircraft was traveling at 112 knots as it exited the usable runway.
Strong or gusting winds and storm conditions were reported around Miami at the time, although the Associated Press reported that it was not raining when the crash occurred.
Officials said determining the cause remains at an early stage.
The crash triggered a large fire and sent thick black smoke into the air, drawing more than 200 firefighters to the scene.
Miami-Dade officials said rescue crews arrived within seconds and had to extricate people trapped inside or beneath vehicles.
The pilot and copilot were also trapped in the cockpit, according to fire officials.
Of five injured people, three were reported in critical condition, while two others were hospitalized with less severe injuries.
Flights were temporarily grounded, and more than 160 flights were canceled and nearly 325 delayed by late Sunday.
Both Amazon and 21 Air said they were cooperating with investigators and expressed condolences to those affected.