A British Airways jet made an emergency landing at London’s Heathrow Airport on Friday after developing a technical problem after takeoff. TV footage showed smoke streaming from one of the engines.

Airport officials briefly closed both runways at Europe’s busiest airport, causing delays. They later resumed operation, but passengers were advised to check their flight status.

British Airways said the Airbus A319 was carrying 75 passengers and crew and that it had just taken off from Heathrow on a flight to Oslo, Norway.

The airline added an investigation is under way.

The jet was surrounded by fire vehicles after it landed, and passengers and crew used evacuation slides to leave the plane. London Ambulance Service said it treated three people for minor injuries.

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