Both runways have been closed at Heathrow Airport after reports of smoke seen coming from the rear of a plane.
The British Airways aircraft was forced to make an emergency landing, a spokeswoman said.
The incident is not thought to be terror related and all passengers are safe.
One London Fire Brigade crew is attending the scene although the fire is now believed to be out.
There is speculation that the plane had run into a flock of birds
Smoke can be seen coming from the plane