Pictures: Olympic rings towed down the ThamesPublished28 February 2012Image caption, Giant Olympic rings have been launched on to the River Thames to mark 150 days until the start of the London Games.Image caption, The rings are 11 metres high and 25 metres wide. They are coloured on one side and have white LED lights on the other.Image caption, They are travelling on a barge passing key landmarks including the Tower of London.Image caption, The Olympic rings cost more than 拢930,000.Image caption, They were a surprising sight on the river.Image caption, Tower Bridge had to be raised to allow the giant rings through.Image caption, The Rings on the River will now go into storage until the start of the Olympics, when they will again appear on the Thames.