A federal aviation official says an Asiana Airlines flight has crashed while landing at San Francisco airport.
It was not immediately known whether there were any injuries.
Federal Aviation Administration spokeswoman Lynn Lunsford says the Boeing 777 crashed at San Francisco Airport while landing today.
A video clip posted to YouTube shows smoke coming from a silver-colored jet on the tarmac. Passengers could be seen jumping down the inflatable emergency slides.
Asiana is South Korea's second-largest airline. The Boeing 777 can carry up to 300 passengers.
