A Boeing 777 jet operated by Korea's Asiana Airlines crash landed Saturday afternoon at the San Francisco International Airport, the U.S. Federal Aviation Administration said.

Although the sequence of events remains unclear, an FAA spokeswoman said the plane crashed on landing and caught fire.

An executive with South Korean conglomerate Samsung, David Eun, a passenger on the flight, said in a Twitter posting published by The Verge technology news Web site that "most everyone (the passengers and crew) seems fine."

A video posted on YouTube showed the plane on the runway with smoke spilling out of the cabin, while passengers were exiting the aircraft via inflatable ramps.

The FAA canceled all flights out of the San Francisco International Airport in the aftermath of the crash landing. EFE