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. It is not clear if there are any casualties or how many people were on board.
Witnesses say the tail of the aircraft fell off just before the aircraft struck the runway. They say the plane wobbled from side to side, causing the collapse of at least one wing.
Television pictures showed a large cloud of smoke streaming from the plane with the roof burned through. Debris from what appeared to be part of the tail trailed behind the plane along the runway.