A United Airlines flight carrying 194 passengers and crew from Los Angeles landed without incident in Sydney early on Thursday after a mayday call caused by low fuel triggered a major emergency response in Australia's largest city. "United flight 839 from Los Angeles to Sydney landed safely . following a mechanical issue," Madhu Unnikrishnan, a spokesman for United Airlines, said in an emailed statement. "The aircraft taxied to the gate and all customers disembarked normally," he said. A spokeswoman for Air Services Australia said the Boeing 787 triggered a mayday call due to low fuel reserves. "No passengers were at risk at any time," she said. A spokesman for Sydney Airport declined to comment. The New South Wales state police said in a statement a major emergency response was activated at Sydney airport after "a pilot reported a problem". Some major roads around the airport were closed as a precaution at 6.36 a.m. local time (2036 GMT Wednesday). The plane landed safely and roads were re-opened three minutes later.