LONDON: The lights have been formally switched on at London 2012's Olympic Stadium.

Prime Minister David Cameron pressed the switch on the 14 light towers, which rise more than 70 metres above the stadium and include a total of 532 individual lights.

The Prime Minister, flanked by London Mayor Boris Johnson and Games organising chief Lord Coe, pushed the button to switch on the floodlights during a special ceremony at the snow-covered stadium.

Dozens of local schoolchildren and stadium construction workers watched the switch on.