WATCH: French Election Campaign On Hold As Paris Terror Attack Probe Builds

PARIS — (CNN) The French presidential election campaign was stopped in its tracks on Friday after a deadly attack on a police bus on the Champs-Elysees in the heart of Paris.

Police on Friday arrested three family members of a known terror suspect, who killed one police officer and badly injured two others in the attack at around 9pm local time on Thursday. A second man, suspected of being linked to the shooting, surrendered himself in Belgium.

ISIS claimed that the attack — days before the first round of voting and just as candidates were taking part in a TV debate — was carried out by one of its “fighters,” whom it called “the Belgian.”

The attacker was shot dead by police at the scene. A source close to the investigation told CNN he was the subject of a “Fiche S” surveillance file and was on the radar of the French domestic security service, DGSI. The man, a French national, had a long criminal record, the source said.

On its media channel, Amaq, ISIS claimed that the attack was carried out by “Abu Yousuf al-Baljiki (the Belgian) and he is one of the Islamic State’s fighters.” It was not clear whether ISIS was referring to the man who surrendered himself in Antwerp.

The three leading presidential candidates, François Fillon, Emmanuel Macron and Marine Le Pen halted campaigning after the shooting, which came three days before French voters go to the polls.

Security in Paris has been building in recent days, but the presence of 50,000 police officers on the streets was not enough to prevent the latest assault, which a source tells CNN is being treated as an act of terror.

French President Francois Hollande convened a meeting of the country’s defense council Friday.

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Election campaigning paused

Coming days before France votes in the first round of its presidential election Sunday, the shooting puts national security, terrorism and immigration at the heart of an already divisive campaign.

With a record number of voters still undecided, analysts say the shooting could play into the narrative pushed by the far-right.

As of Friday morning local time, leading candidates François Fillon, Emmanuel Macron and Marine Le Pen had all canceled campaign events, with Macron citing the extra burden policing political rallies placed on the security services.

Speaking during a televised debate around the time of Thursday’s attack, Fillon said there was “no room for pursuing today or tomorrow an electoral campaign because first of all we have to demonstrate our solidarity with the police officers.”

Left-wing insurgent Jean-Luc Mélenchon warned against allowing panic to “interrupt democracy.”

Far-right candidate Marine Le Pen said the attack showed the time for naivety “is over.”

Investigation ongoing

The attack unfolded on the Champs-Elysees around 9 p.m. local time (3 p.m. ET) when a car stopped in front of a police van, according to French Interior Ministry spokesman Pierre Henry Brandet.

A man emerged from the car and opened fire on the van with an “automatic weapon,” killing one officer instantly, Brandet said. The man “then ran away, managing to shoot and wound two other policemen. Other policemen engaged and shot and killed the attacker,” he added.

The dead officer was 30, Paris Prosecutor Francois Molins said. One of the wounded officers was critically injured but is improving, he said. Also wounded was a female tourist.

The shooting has not officially been declared a terrorist act but anti-terrorist forces are leading the investigation, French President Hollande said.

Molins said he would reveal the shooter’s identity in a press conference Friday, adding that officers were searching the man’s residence in Chelles in the Paris suburb of Seine-et-Marne.

The source close to the investigation said the man had a long criminal record. He shot two officers in 2001 after being stopped by a police, according to the source. He was taken into custody but while being questioned grabbed another officer’s gun and shot him three times, the source added. He was convicted in that attack and had a criminal record because of involvement in violent robberies.

Earlier this week French authorities arrested two men in Marseille who were allegedly planning an attack in a run-up to the election.

World leaders react

Speaking in Indonesia Friday, US Vice President Mike Pence said the attack was just the latest reminder “that terrorism can strike anywhere at anytime.”

Quoting President Donald Trump, Pence said “we have to be strong, and we have to be vigilant.”

Trump himself weighed in at a news conference in Washington following the attack. “What can you say? It never ends,” the President said.

German Chancellor Angela Merkel expressed her condolences to Hollande and said her sympathy “goes out to the victims and their families,” according to her spokesman Steffen Seibert.

British Prime Minister Theresa May also spoke to Hollande. In a statement, the UK government said it “strongly condemns the appalling terrorist attack in Paris.”

France has been in a state of emergency since the 2015 Paris attacks, which left 130 people dead. Parliament voted in December to extend the extraordinary provisions to ensure the protection of upcoming presidential and general elections.

The-CNN-Wire ™ & © 2017 Cable News Network, Inc., a Time Warner Company. All rights reserved. (PHOTO: BFMTV via CNN)

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