"The perpetrator of the attack in Champs Elysee in central Paris is Abu Yussef the Belgian and he is one of the Islamic State's fighters", it said.
Hollande, who said he was convinced the shooting was a "terrorist act", cancelled a trip to Bretagne and will chair a security cabinet meeting Friday.
The Islamic State of Iraq and Greater Syria claimed responsibility for the attack, and the actual identity of the attacker has been verified, according to the Associated Press. The ISIS statement said the attacker was a Belgian national and cited "security sources".
CNN could not independently confirm that claim.
The attacker was being investigated over his possible intention to kill police officers, sources close to the investigation said.
The killer, identified as a 39-year-old French man, was known to anti-terror police, sources told AFP, and raids took place at his address in a suburb to the east of Paris.
French President Francois Hollande had already said that the authorities suspect the attack was "of a terrorist nature", according to a French 24 translation of his news conference Thursday night.
SHAPIRO: NPR's Eleanor Beardsley on the Champs-Elysees in Paris, thank you very much.
A French police union had announced a second officer had died, but the interior ministry later said this was not the case. Archive reports by French newspaper Le Parisien say that Cheurfi was convicted of attacking a police officer in 2001. "Other policemen engaged and shot and killed the attacker", Brandet said. One of the officers died right away. Also wounded was a female tourist.
The wide avenue that leads away from the Arc de Triomphe had been crowded with Parisians and tourists enjoying a spring evening, but police quickly cleared the area, which remained empty well into the night of all but heavily armed security forces and police vehicles. "And this is a very delicate period for them, just three days before the election", the Italian prime minister said.
France has been in a state of emergency since 2015 in the wake of numerous terrorist attacks that have killed over 200 people.
The shooting occurred during a prime time television debate between all 11 official candidates, just three days before the first stage of the country's general election.
Observers had long feared bloodshed ahead of Sunday's vote in France following a string of atrocities since 2015 and the violence is likely to thrust security to the front of voters' minds.
The shooting comes two days after the arrest of two men in southern Marseille with weapons and explosives who were suspected of preparing an attack to disrupt the campaign.
Witnesses said the pair had targeted a police vehicle parked at a red light using Kalashnikovs. What can you say.
Paris resident Daoud Kal, 29, said he was walking in the area near a metro station when he heard four to five shots.
The CNN Paris bureau is on this street and staffers reported hearing a dozen shots.
The shooter opened fire with an automatic weapon on a police van on the world-famous boulevard at around 9:00 pm (1900 GMT), prompting tourists and visitors to run for their lives.
Officers could be seen forcibly removing innocent citizens from the area as they attempted to get them to safety.
US President Donald Trump condemned the shooting, saying: "It just never ends". And what can you say?
San Cristobal Mayor Patricia Gutierrez has said that Ramirez was shot to death by people who appeared to be government supporters. He said Venezuela's Works Ministry has guaranteed that the workers will keep their jobs, but added: "We don't feel happy".
French far-right presidential candidate Marine Le Pen tweeted, "My emotions and solidarity for the police, once again targeted". Candidates went ahead with a debate Thursday night. "First of all, our condolences from our country to the people of France".
He had been convicted in 2005 of three counts of attempted murder, with two of these against police officers, sources said. The vote is on Sunday, and today is the last day of campaigning, and everyone has called it off to, you know, hold.
Tensions are high after the United States military recently ordered a navy strike group to move towards the Korean peninsula. South Korean military officials said they believe the object was a new type of ICBM.
Former French Open champion Stan Wawrinka was also routed, with the Swiss third seed losing to Pablo Cuevas of Uruguay 6-4, 6-4. After a long game Berdych broke back for 5-5 and then forced a tiebreaker, but the Czech player wilted against the 2014 U.S.
Pearl Jam , the Electric Light Orchestra, Journey , Yes, and the late Tupac Shakur were also among the inductees. His wife, Jill, was teary-eyed in the audience at the Barclays Center in Brooklyn as fans continued to cheer.
French far-right presidential candidate Marine Le Pen tweeted, "My emotions and solidarity for the police, once again targeted". Police and soldiers sealed off the area, ordering tourists back into hotels and blocking people from approaching the scene.
Chaffetz leaves door open to not finish term in House
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Murray loses to Ramos-Vinolas at Monte Carlo Masters
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Will Curiel's case be a DACA test for Trump?
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Sports Direct buys two US chains in £78m debt deal
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