Luckily the plane landed safely and nobody was killed or injured.
One possible cause being considered is a 'bird strike'.
Quote:
A British Airways (BA) plane had to return to Heathrow Airport to make an emergency landing after black smoke was seen coming from an engine.
Both runways were closed as passengers and crew were evacuated from the plane down emergency chutes.
BA said the Heathrow to Oslo service turned back after a technical fault at about 09:00 BST. Witnesses reported seeing flames coming from the engine.
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http://www.bbc.co.uk/news/uk-england-22652718