United Airlines flight UA131 en route from Heathrow to Washington made an emergency landing in Dublin.
According to pilots, the Boeing 757-200 developed possible engine trouble. There was also smoke in the cockpit.
Dublin Airport Fire and Rescue Service, dozens of firefighters and Dublin Airport Police responded to the scene.
The flight departed from Heathrow at 1:05pm. None of the 147 passengers or crew of nine were injured.