One person told Sky News: "As you looked up you could just see the flames being chucked out of the engine ... It was on full fire when we saw it."
Both runways were shut at Heathrow Airport where the British Airways aircraft was forced to make an emergency landing due to an "aircraft fire."
The incident is not thought to be terror related and all passengers are safe.
A statement from British Airways said: "The BA762, Heathrow to Oslo service, returned back to Heathrow shortly after take-off due to a technical fault.
"The Airbus A319 aircraft was carrying 75 customers. The aircraft landed safely and emergency slides were deployed and we are currently caring for our customers.
"Emergency services attended the aircraft. We will be carrying out a full investigation into the incident."
One picture shared on Twitter appears to show the engine that was not on fire exposed as it is overworked.
London Fire Brigade crew have said they believe that the fire is now out.
There is speculation that the plane had run into a flock of birds.
The plane landed on the northern runway which remains shut but the southern runway has now been reopened.
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