Crowds at the technical rehearsal for the opening ceremony of the London Olympic Games have been told to 'save the surprise' for Friday's showpiece.
The hashtag #savethesurprise was displayed on the big screens inside the Olympic stadium, although many people have uploaded pictures to the internet.
Images on social media site Twitter depicted a raised grass platform in the middle of the stadium surrounded by man-made clouds that were held by string.
Those who had a ticket to the event, co-ordinated by Oscar-winning director Danny Boyle, may have experienced problems getting there as the Central Line of the underground was closed between White City and Liverpool Street.
