Dismay as US blocks new accord

There has been dismay at a UN disarmament conference in Geneva as the US turned its back on another international accord, this time one designed to enforce a ban on the use of biological weapons. Washington's representative said the US was unable to support the draft accord - the result of years of debate - because it would not achieve its goals and would hurt American interests. The BBC's Stephen Sackur reports

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	Lead negotiator, Ambassador Tibor Toth from Hungary says the implementation of the protocol would be senseless without the US
	Weapons analyst Michael Crowley: "The US walkout endangers their security and that of the rest of the world"
	Centre for Defence Studies Prof Michael Clarke: "It looks as if the US is trying to get out of interdependence agreements"
	US negotiator, Donald Mayley: "The draft protocol will put national security and confidential business information at risk."
	Biological weapons expert Dr Barbara Rosenberg: "The US is becoming more politically isolated"