In reaction to the Christmas Day bombing attempt against a U.S. airliner, Australia says it will spend about $173 million over the next four years to beef up airport security. The measures include full-body scanners, more bomb-sniffing dogs and high-tech screeners for detecting liquid explosives. "New technologies, better training and greater domestic and international cooperation can help us stay one step ahead" of terrorists, said Prime Minister Kevin Rudd.

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