LONDON (Reuters) - British Airways said on Friday a plane travelling from London to Oslo was forced to make an emergency landing after a fault in one of the engines. Video footage on Sky News showed the plane at London's Heathrow's airport with smoke billowing out of its right engine. "It's right engine was on fire. This plane was coming over and suddenly the tone of the engine changed dramatically. I'd almost say it was like a blowout or an explosion," witness Clive Cook told Sky News. ...