Two people were killed and more than 150 others injured when a plane crash landed at San Francisco International Airport.
The Asiana Airlines flight from Seoul, South Korea, was believed to be carrying 291 passengers.
The FBI said it had ruled out terrorism, Sky News reported.
Many more are believed to have been injured, with passengers escaping the burning wreckage of the plane by jumping down the emergency inflatable slides to safety.
The FBI ruled out terrorism
British Airways (BA) and Virgin Atlantic both operate flights between London and San Francisco airport, which has been closed while the incident is dealt with.
A spokeswoman for BA said its two flights which left Heathrow today had been diverted to Seattle and Vancouver airports.
A Virgin Atlantic spokeswoman said it operated one daily flight between Heathrow and San Francisco.
Story continues after slideshow...
SFO Plane Crash
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Fire crews work the crash site of Asiana Flight 214 at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green) (credit:AP)
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This aerial photo shows the wreckage of the Asiana Flight 214 airplane after it crashed at the San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Marcio Jose Sanchez) (credit:AP)
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This frame grab from video provided by KTVU shows the scene after an Asiana Airlines flight crashed while landing at San Francisco Airport on Saturday, July 6, 2013, in San Francisco. (AP Photo/KTVU) MANDATORY CREDIT (credit:AP)
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People at the airport look out at the burning plane (photo via Twitsnoop) (credit:Twitter.com/Twitsnoop)
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A fire truck sprays water on Asiana Flight 214 after it crashed at San Francisco International Airport on Saturday, July 6, 2013, in San Francisco. (AP Photo/Noah Berger) (credit:AP)
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Picture of large gray smoke plume via @mgescuro on Twitter (credit:twitter.com/mgescuro)
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This frame grab from video provided by KTVU shows the scene after an Asiana Airlines flight crashed while landing at San Francisco Airport on Saturday, July 6, 2013, in San Francisco. (AP Photo/KTVU) MANDATORY CREDIT (credit:AP)
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The tail of Asiana Flight 214 is seen after it crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Jeff Chiu) (credit:AP)
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(credit:@mcc_marilyn via CrowdMedia.co)
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(credit:@TheRebeccaPrjct via CrowdMedia.co)
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An Asiana Airlines Boeing 777 is seen on the runway at San Francisco International Airport after crash landing on July 6, 2013. There were no immediate reports of casualties and one apparent survivor tweeted a picture of passengers fleeing the plane. Video footage showed the jet, Flight 214 from Seoul, on its belly surrounded by firefighters. AFP PHOTO/JOSH EDELSON (Photo credit should read Josh Edelson/AFP/Getty Images) (credit:Getty Images)
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An Asiana Airlines Boeing 777 is seen on the runway at San Francisco International Airport after crash landing on July 6, 2013. There were no immediate reports of casualties and one apparent survivor tweeted a picture of passengers fleeing the plane. Video footage showed the jet, Flight 214 from Seoul, on its belly surrounded by firefighters. AFP PHOTO/JOSH EDELSON (Photo credit should read Josh Edelson/AFP/Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 6: Traffic backs up on the US Route 101 South after a Boeing 777 airplane crashed landed at San Francisco International Airport July 6, 2013 in San Francisco, California. A passenger aircraft from Asiana Airlines coming from Seoul, South Korea crashed landed on the runway. No word so far on injuries or deaths. (Photo by Sarah Rice/Getty Images) (credit:Getty Images)
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An Asiana Airlines Boeing 777 is seen on the runway at San Francisco International Airport after crash landing on July 6, 2013. There were no immediate reports of casualties and one apparent survivor tweeted a picture of passengers fleeing the plane. Video footage showed the jet, Flight 214 from Seoul, on its belly surrounded by firefighters. AFP PHOTO/JOSH EDELSON (Photo credit should read Josh Edelson/AFP/Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 06: A Boeing 777 airplane lies burned on the runway after it crash landed at San Francisco International Airport July 6, 2013 in San Francisco, California. An Asiana Airlines passenger aircraft coming from Seoul, South Korea crashed while landing. There has been at least two casualties reported. (Photo by Ezra Shaw/Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 06: A Boeing 777 airplane lies burned on the runway after it crash landed at San Francisco International Airport July 6, 2013 in San Francisco, California. An Asiana Airlines passenger aircraft coming from Seoul, South Korea crashed while landing. There has been at least two casualties reported. (Photo by Ezra Shaw/Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 06: A Boeing 777 airplane lies burned on the runway after it crash landed at San Francisco International Airport July 6, 2013 in San Francisco, California. An Asiana Airlines passenger aircraft coming from Seoul, South Korea crashed while landing. There has been at least two casualties reported. (Photo by Ezra Shaw/Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 6: The remains of a Boeing 777 airplane sits on a tarmac after having crashed while landing at San Francisco International Airport July 6, 2013 in San Francisco, California. A passenger aircraft from Asiana Airlines coming from Seoul, South Korea crashed landed while on it's decent. No word so far on injuries or deaths. (Photo by Kimberly White/Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 6: (EDITORS NOTE: Retransmission with alternate crop.) A Boeing 777 airplane lies burned on the runway after it crashed landed at San Francisco International Airport July 6, 2013 in San Francisco, California. A passenger aircraft from Asiana Airlines coming from Seoul, South Korea crashed landed while on it's landing decent. No word so far on injuries or deaths. (Photo by Justin Sullivan/Getty Images) (credit:Getty Images)
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Map locates San Francisco airport.; 1c x 3 inches; 46.5 mm x 76 mm; (credit:AP)
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This photo provided by Wei Yeh shows what a federal aviation official says was an Asiana Airlines flight crashing while landing at San Francisco airport on Saturday, July 6, 2013. (AP Photo/Wei Yeh) (credit:AP)
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This photo provided by Zach Custer shows smoke rising from what a federal aviation official says was an Asiana Airlines flight crashing while landing at San Francisco airport on Saturday, July 6, 2013. It was not immediately known whether there were any injuries. (AP Photo/Zach Custer) (credit:AP)
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Emergency responders work at the site of the crash of Asiana Flight 214 at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green) (credit:AP)
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Smokes rises from Asiana Flight 214 after it crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green) (credit:AP)
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Fire crews work the crash site of Asiana Flight 214 at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green) (credit:AP)
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This aerial photo shows the wreckage of the Asiana Flight 214 airplane, right, after it crashed, as another plane approaches at the San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Marcio Jose Sanchez) (credit:AP)
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Planes from various airlines are docked at the terminals after Asiana Flight 214 crashed at the San Francisco International in San Francisco, Saturday, July 6, 2013. (AP Photo/Marcio Jose Sanchez) (credit:AP)
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Investigators comb the end of a runway at San Francisco International Airport following the crash of Asiana Flight 214 on Saturday, July 6, 2013, in San Francisco. (AP Photo/Noah Berger) (credit:AP)
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SAN FRANCISCO, CA - JULY 7: In this handout photo provided by the National Transportation Safety Board, the wreckage of Asiana Airlines flight 214 lies near the runway following yesterday's crash, on July 7, 2013 in San Francisco, California. The Boeing 777 passenger aircraft from Asiana Airlines coming from Seoul, South Korea crashed landed on the runway at San Francisco International Airport. Two people died and dozens were injured in the crash. (Photo by NTSB via Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 7: In this handout photo provided by the National Transportation Safety Board, oxygen masks hang from the ceiling in the cabin interior of Asiana Airlines flight 214 following yesterday's crash, on July 7, 2013 in San Francisco, California. The Boeing 777 passenger aircraft from Asiana Airlines coming from Seoul, South Korea crashed landed on the runway at San Francisco International Airport. Two people died and dozens were injured in the crash. (Photo by NTSB via Getty Images) (credit:Getty Images)
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SAN FRANCISCO, CA - JULY 7: In this handout photo provided by the National Transportation Safety Board, NTSB investigators examine the wreckage of Asiana Airlines flight 214 following yesterday's crash, on July 7, 2013 in San Francisco, California. The Boeing 777 passenger aircraft from Asiana Airlines coming from Seoul, South Korea crashed landed on the runway at San Francisco International Airport. Two people died and dozens were injured in the crash. (Photo by NTSB via Getty Images) (credit:Getty Images)
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People take a photo of the crashed Asiana Airlines Boeing 777 at San Francisco International Airport on July 7, 2013. US officials were combing through the wreckage of an Asiana Airlines Boeing 777 passenger jet in San Francisco as they tried to determine why it crashed onto the runway, killing two people and injuring 182 others, on July 6. AFP PHOTO/JOSH EDELSON (Photo credit should read Josh Edelson/AFP/Getty Images) (credit:Getty Images)
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A United Airlines plane readies for take off next to the wreckage of Asiana Flight 214 at the San Francisco International Airport in San Francisco, Sunday, July 7, 2013. (AP Photo/Marcio Jose Sanchez) (credit:AP)
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Dave Estrada, bottom right, photographs the wreckage of Asiana Flight 214 as a United Airlines plane arrives at the San Francisco International Airport in San Francisco, Sunday, July 7, 2013. (AP Photo/Marcio Jose Sanchez) (credit:AP)
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INCHEON, SOUTH KOREA - JULY 08: Passengers who were involved in the San Fransisco plane crash arrive at Incheon International Airport on July 8, 2013 in Incheon, South Korea. Two people are dead and more than 180 injured after an Asiana Airlines Boeing 777 aircraft coming from Seoul, South Korea crash-landed at San Francisco International Airport on July 6, 2013. (Photo by Chung Sung-Jun/Getty Images) (credit:Getty Images)
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SEOUL, SOUTH KOREA - JULY 08: Passengers from San Fransisco plane crash arrive at Incheon International Airport on July 8, 2013 in Incheon, South Korea. A Boeing 777 Asiana Airlines passenger aircraft coming from Seoul, South Korea crashed while landing. Two fatalities have so far been reported. (Photo by Chung Sung-Jun/Getty Images) (credit:Getty Images)
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INCHEON, SOUTH KOREA - JULY 08: Passengers who were involved in the San Fransisco plane crash arrive at Incheon International Airport on July 8, 2013 in Incheon, South Korea. Two people are dead and more than 180 injured after an Asiana Airlines Boeing 777 aircraft coming from Seoul, South Korea crash-landed at San Francisco International Airport on July 6, 2013. (Photo by Chung Sung-Jun/Getty Images) (credit:Getty Images)
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INCHEON, SOUTH KOREA - JULY 08: Passengers who were involved in the San Fransisco plane crash arrive at Incheon International Airport on July 8, 2013 in Incheon, South Korea. Two people are dead and more than 180 injured after an Asiana Airlines Boeing 777 aircraft coming from Seoul, South Korea crash-landed at San Francisco International Airport on July 6, 2013. (Photo by Chung Sung-Jun/Getty Images) (credit:Getty Images)
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An unidentified family member of one of two Chinese students killed in a crash of Asiana Airlines' plane on Saturday, cries at the Airlines' counter as she and other family members check in a flight to San Francisco at Pudong International Airport in Shanghai, China, Monday, July 8, 2013. The Asiana flight crashed upon landing Saturday, July 6, at San Francisco International Airport, and the two of the 307 passengers aboard were killed. (AP Photo/Eugene Hoshiko) (credit:AP)
She added: "Currently our flights to and from San Francisco are operating as scheduled. We advise passengers to
continue to check Flight Status for the very latest information."
Television footage of the incident showed the Boeing 777 lying on the runway with thick plumes of smoke pouring out from it, while debris was strewn across the tarmac.
Passengers used emergency slides to escape
The top of the fuselage appeared to be burned away while the entire tail was missing.
Up to 300 passengers were thought to be on board, with images showing many of them being tended to by emergency services at the scene.
A spokeswoman for San Francisco General Hospital told a local radio station that 10 passengers had been admitted including two children, with all in critical condition.