Gunman kills Paris police officer, wounds three others

PARIS -- A gunman opened fire on police on Paris" iconic Champs-Elysees boulevard Thursday night, killing one officer and wounding three people before police shot and killed him. The Islamic State group quickly claimed responsibility for the attack, which hit just three days before a tense presidential election.

Security already has been a dominant theme in the campaign, and the violence on the sparkling avenue threatened to weigh on voters" decisions. Candidates cancelled or rescheduled final campaign events ahead of Sunday"s first round vote.

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