Boats from the Royal Marines together with Royal Navy helicopters have been carrying out drills on the River Thames in preparation for the London 2012 Olympic Games
Elite British security teams took to the River Thames as part of a massive security rehearsal to foil terror disaster at the Olympics.
The Metropolitan Police's Marine Policing Unit took to the water in rigid inflatables and fast response boats whilst military personnel flew above in a Lynx Navy helicopter.
Armed officers dressed in black were seen racing up to a Thames cruise vessel in their inflatable boats, before storming it and climbing onto its roof.
A helicopter circled close above the boats during the practice operation.
Assistant Commissioner Chris Allison, head of the force's security operation for the Games, said: "All of our planning is designed to mitigate against potential risks during the summer of 2012, and this is an example of where we will be using specialist military capability to support us.
"This exercise is not in response to any specific threat, but is part of our planning to pre-deploy certain specialist assets to bolster our operation."
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Yes, if only all terrorists would hold their craft that steady while being boarded by special forces. But .. a most enjoyable turn by the Navy Lynx over the vessel in question!