(CNN) - A Boeing 777 operated by Asiana Airlines crashed while landing Saturday at San Francisco International Airport.
Flight 214 left Seoul's Incheon International Airport earlier Saturday and flew 10 hours and 23 minutes to California, according to FlightAware, a website that offers tracking services for private and commercial air traffic.
Anthony Castorani, who witnessed the flight land from a nearby hotel, said he saw the plane touch the ground then noticed a larger plume of white smoke.
"You heard a pop and you immediately saw a large, brief fireball that came from underneath the aircraft," he told CNN. "It began to cartwheel."
Kristina Stapchuck saw the dramatic scene unfold from her seat on a plane on the airport tarmac. Soon after Flight 214 touched down, "it looked like the tires slipped a little bit and it rocked back," she told CNN.
Parts of the plane began to break off as it rocked and then began to spin.
"It all happened so suddenly," Stapchuck told CNN.
Video taken soon after the crash and posted on YouTube showed dark gray smoke rising from the plane, which appeared to be upright. That smoke later became white, even as fire crews continued to douse the plane.
A photograph posted to Twitter shows what appear to be passengers walking off the plane, some of them toting bags, as smoke rises from the other side.
The top of the aircraft was charred and, in spots, gone entirely, according to video from CNN affiliate KTVU. The plane was on its belly, with no landing gear evident and the rear tail of the plane gone.