French police are tweeting that they have "contained" a person in Trappes, west of Paris, following reports of a knife attack.
French Interior Minister Gerard Collomb tweeted that the attacker had been neutralized without saying if he was dead.
Earlier, BFM-TV reported that a man had attacked passersby with a knife, killing one and seriously injuring two others, before being shot by police.
He said his thoughts were with "the victims and their loved ones," without saying how many victims there were.
Police and Interior Ministry officials said the attack claimed at least one victim. The officials spoke on condition of anonymity because there were not authorized to discuss the situation publicly.
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