A United Airlines flight carrying 194 passengers and crew from Los Angeles has made an emergency landing after the captain declared mayday due to low fuel levels.
Emergency services on the ground closed roads around the airport and fire crews positioned themselves on the runway.
United Airlines confirmed the incident in a statement.
"United flight 839 from Los Angeles to Sydney landed safely following a mechanical issue," a spokesperson for United Airlines said.
The aircraft parked at its intended gate, and passengers disembarked normally.
The New South Wales state police said in a statement that a major emergency response was activated at Sydney Airport after "a pilot reported a problem".
Roads have since been reopened.