PARIS (AP) - French far-right presidential candidate Marine Le Pen says her anti-Islam agenda has been vindicated: A French Muslim claiming ties to al-Qaida has taken responsibility for the country's worst killing spree in years.

The specter of radical Islam's grip on France has threatened to overturn France's presidential race, in which Socialist Francois Hollande has long been the pollster's favorite to unseat the divisive conservative president, Nicolas Sarkozy.

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