Paris police say a gunman has killed a police officer and wounded another before being killed himself in an attack on the Champs-Elysees shopping district.
It was unclear how Trump concluded that terrorism may have been a factor. Paris police haVE yet to announce a motive,
Trump is also offering condolences from the US to the people of France.
He calls the attack a "terrible thing" and says "it never ends." He says people must be strong and vigilant.
The attack came three days before the first round of balloting in France's presidential election.
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