"It means, as we make the land borders harder to cross from a land border crossing standpoint, that we need to be looking out into our coasts and to the waters," said Napolitano.
Last Christmas, Umar Farouk Abdulmutallab, a young Nigerian who claims to have been trained by Al-Qaeda operatives in the Yemen, failed to detonate explosives concealed in his underwear on a packed transatlantic airliner as it came in to land in Detroit.
The US authorities responded by installing new screening machines and initiating draconian body searches at airports.
Napolitano said international travelers in the United States also face tight intelligence screening even before they reach the boarding gate.
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