BREAKING NEWS: An Asiana Airlines flight crashed while landing at San Francisco International Airport, Fox News confirms.

It was not immediately known whether there were any injuries.

Federal Aviation Administration spokeswoman Laura Brown says Flight 214 was coming from Seoul, South Korea and was supposed to land on runway 28 left at San Francisco International Airport at 11:26 PDT.

She said the sequence of events was still unclear, but it appeared the plane landed and then crashed.

A video clip posted to Youtube shows smoke coming from the silver-colored Boeing 777 jet on the tarmac. Passengers could be seen jumping down the inflatable emergency slides.

Fire trucks could be seen spraying white fire retardant on the wreckage.

A call to the airline seeking comment wasn't immediately returned.

It was not immediately known how many passengers the plane was carrying. A Boeing 777-200 can carry between 246 to 300 passengers. The twin-engine aircraft is one of Boeing's best selling airplane models. It is often used for flights of 12 hours or more, from one continent to another.

The National Transportation Safety Board says it's sending a team of investigators to San Francisco to probe the crash of an Asiana airliner.

NTSB spokeswoman Kelly Nantel said Saturday that NTSB Chairman Deborah Hersman would head the team.

All flights out of San Francisco International Airport have been canceled, the FAA said.

A tweet from Boeing said the company's thoughts are with those affected by the crash, and that the will assist the NTSB in the investigation.