Airport screeners are using new technology to find explosives instead of hunting for tweezers, Department of Homeland Security secretary Michael Chertoff said on Friday. Locked and armoured cockpit doors and air marshals on planes are part of a switch in main security concern from hijackers to people who might want to blow up airplanes, Chertoff said in a speech at an event in San Francisco hosted by the Commonwealth Club. He said: "The things we're really worried about are explosives." Airport screeners are being retrained "to move them away from looking for things like nail clippers to more sophisticated chemicals and detonating devices".

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