A British Airways aircraft taxis at Terminal 5 of Heathrow Airport in west London, on July 30, 2010.
- One runway remains closed after an emergency landing at London Heathrow airport
- British Airways says the plane, en route to Oslo, had to turn back because of a technical fault
- The Airbus A319 aircraft was carrying 75 customers, the airline says
- Both runways were closed for a time at Heathrow, one of the world's busiest airports
(CNN) -- A British Airways plane made an emergency landing at London's Heathrow Airport Friday morning after developing a technical fault, the airline said.
Both the airport's runways were closed for a period but the southern runway has now reopened. The northern runway remains closed.
British Airways said the flight had turned back shortly after leaving for the Norwegian capital, Oslo, "due to a technical fault."
The Airbus A319 aircraft was carrying 75 passengers, the airline said. They were evacuated from the plane using emergency slides.
"All passengers & crew have been safely evacuated from an aircraft which is on the northern runway," the official Heathrow Twitter feed said.
London Fire Brigade said a crew was helping the airport fire service put out an aircraft fire. "We believe the fire is now out," it said via Twitter.
Heathrow, which serves as an international hub, was ranked the third busiest airport in the world in 2012 after Atlanta and Beijing, according to Airports Council International.
The runway closure is likely to impact many travelers.
On average, 190,000 passengers travel through the airport each day, half arriving and half departing, according to Heathrow's website.
CNN's Claudia Rebaza and Dominique Van Heerden contributed to this report.
