A Boeing 777 passenger jet has crash landed at the San Francisco International Airport in California.
Officials have identified it as Asiana Airlines Flight 214, originating in Seoul, South Korea.
Witnesses say the tail of the aircraft fell off just before the aircraft struck the runway. A large cloud of smoke could be seen streaming from the plane with two emergency escape chutes emerging from the side.
It is not clear if there are any casualties. Also not known at this time is how many people were on board.