"We have stopped many of the terrorist plots and attempts from the past through good intelligence, " Rep. Michael McCaul, R-Texas, who chairs the House Homeland Security Committee, told CNN.

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One study of the Red Brigades, the Italian terrorist group of the nineteen-seventies, found that seventy per cent of recruits had at least one good friend already in the organization.

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On foreign policy, perhaps the most important issue, Mr Bush has transformed American policy in response to the terrorist attacks and (less noticed) has established good relations with the great powers of Russia, China, India and Japan.

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Cape Town police have set up a special urban terrorist unit, Operation Good Hope, to investigate the incidents.

BBC: Reward for Cape Town bombers' arrest