By Emmanuel Jarry and John Irish PARIS (Reuters) - Investigators are trying to find out whether the man who shot dead a policeman in Paris had accomplices, a prosecutor said, adding that he had shown no previous signs of radicalization despite a long prison record. The gunman, identified as Karim Cheurfi, opened fire on a police vehicle parked on the Champs Elysees in Paris late on Thursday, killing one officer and injuring two others before being shot dead. The attack, which was claimed by Islamic State, overshadowed the last day of campaigning for Sunday's presidential election first round.



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