Heathrow Airport authorities have said that the airport is now "fully operational" and is returning to normal after a temporary shutdown and the cancellation of nearly 200 flights.
London Ambulance Service treated three patients for minor injuries after the emergency landing, the British Airways said on Twitter.
"The BA762, Heathrow to Oslo service, returned back to Heathrow shortly after take-off due to a technical fault" the Airways said in a statement.
"The aircraft landed safely and emergency slides were deployed and we are currently caring for our customers.
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"Emergency services attended the aircraft. We will be carrying out a full investigation into the incident, which will also be examined by the Air Accidents Investigation Branch," the statement added.
Airport officials initially shut both runways of one of the world's busiest airports but soon reopened the southern strip.
The northern runway was reopened a few hours later.
Heathrow is the world's third busiest two-runway airport with a flight taking off or landing every 45 seconds.