Giant Olympic rings measuring 11m high by 25m have been launched onto the River Thames. The rings travelled on a barge from London Bridge to the Thames Barrier, passing some of London's most iconic landmarks.

The launch of the rings, which are coloured on one side and have white LED lights on the other, marked 150 days to go to the start of the Olympic Games.

The journey lasted from morning until evening. After reaching the Thames Barrier the barge headed back to Tower Bridge.

The rings were originally intended to start their journey at Battersea Bridge but instead were unveiled at London Bridge (here lit up red) meaning that they missed going past the Houses of Parliament. Officials said this was due to tidal flows and the height of the river.

The rings stopped at some landmarks to give people time to view them.

Elise Norman sent in a photograph from her vantage point.

London Mayor, Boris Johnson, was present to watch the Olympic Rings journey down the river.