Shortly after Sarkozy came into office, French police made a series of lightning raids in the greater Paris area, arresting more than two dozen people suspected of planning terrorist acts in France or elsewhere, or of links to the Tunisia synagogue attack.
Britain has also kept close tabs on its Islamic radicals. The heightened security has not always been welcomed.
From time to time press reports tell of heightened terror alerts around London, and drills have been conducted on the London underground rail system, for example, but phlegmatic Londoners have tended to go about their business as usual.
Most Britons believe their security services are better trained and more effective than those in the US, but the government is not being complacent.
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