With the first round of voting scheduled for Sunday, center-right candidate Francois Fillon, far-right candidate Marine Le Pen and leftist candidate Emmanuel Macron announced they halted their campaigns in light of the attack.
Though a note sympathizing with Islamic State was found near Cheurfi's body, the prosecutors said that he wasn't radicalised.
In Washington, U.S. President Donald Trump offered his condolences after what he said "looks like another terrorist attack".
More than 50,000 police officers were on hand for security in Paris this week, as the vote nears.
The attack came three days before the first round of balloting in France's tense presidential election.
Islamic State, which has hundreds of French-speaking fighters, claimed responsibility for the Champs Elysees shooting soon afterwards, in a statement identifying the attacker as "Abu Yousif al-Belgiki [the Belgian]".
All the candidates are seeking to woo the huge number of undecideds - some 31 percent of those likely to vote, according to an Ipsos poll on Friday.
France has lived under a state of emergency since 2015 and has suffered a spate of Islamist militant attacks, mostly perpetrated by young men who grew up in France and Belgium, and that have killed more than 230 people in the past two years.
"With four leading candidates running neck and neck and up to a third of voters still undecided, even a marginal effect in increasing support for a particular candidate could be decisive", he said.
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Hollande's speech also bore a political message to the two presidential candidates who will face each other in a runoff election on May 7.
Le Pen and Fillon canceled their last campaign events Friday over security concerns.
"Nothing must hamper this democratic moment, essential for our country", Cazeneuve said after a high-level meeting Friday that reviewed the government's security plans.
John Finney, an American tourist from Kentucky visiting Paris with his family told NBC News that he had been 10 feet away when the shooter opened fire.
"It puts internal security on the top of the agenda and on the top of people's consciousness so I would think that this is definitely going to affect people's decisions on Sunday", she said. An assault on a soldier in February at Paris's Louvre museum by a man wielding a machete also had no obvious impact on this year's opinion polls, which have consistently said that voters see unemployment and the trustworthiness of politicians as bigger issues. Trump told the AP in an interview he was not explicitly endorsing Le Pen but that he believes the attack will affect how French people vote on Sunday.
Candidates in the election said they had been warned about the Marseille attackers. French President Francois Hollande classified the incident as a terrorist attack.
He had also been at the venue a year later, as it was reopened with a concert by Sting.
Police officers gathered at the spot where their colleague was killed yesterday to lay flowers and say farewell. "To express our sadness and anger facing this new attack in which one of our own has died for France, serving the French population".
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