A gunman opened fire on police on Paris' iconic Champs-Elysees boulevard Thursday night, killing one officer and wounding three people before police shot and killed him. The Islamic State group quickly claimed responsibility for the attack, which came just three days before France's close presidential election.
Security already has been a dominant theme in the campaign, and the violence on the sparkling avenue threatened to weigh on voters' decisions. Candidates canceled or rescheduled final campaign events ahead of Sunday's first round vote.
Early Friday, the Paris prosecutor's office leading the investigation said investigators found a pump-action shotgun and knives in the gunman's car. Investigators also searched a home in an eastern suburb of Paris believed linked to the attack.
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Offering more insight into the gunman's life, two French officials who asked to remain anonymous said the gunman was detained in February after speaking threateningly about the police but was then released for lack of evidence. He was also convicted in 2003 of attempted homicide in shootings on two police officers. He was identified Friday as a 39-year-old man from Paris.
Officials put police tape around the Champs-Elysees, and police and soldiers were stationed at multiple sites around the area Friday morning.
Authorities are trying to determine whether "one or more people" might have helped the attacker, Interior Ministry spokesman Pierre-Henry Brandet told reporters at the scene of the shooting.
One officer was killed and two police officers were seriously wounded when the attacker emerged from a car and used an automatic weapon to shoot at officers outside a Marks & Spencer's department store at the center of the Champs-Elysees, anti-terrorism prosecutor Francois Molins said.
A female foreign tourist also was wounded, Molins said.
The Islamic State group's claim of responsibility just a few hours after the attack came unusually swiftly for the extremist group, which has been losing territory in Iraq and Syria.
The attacker had been flagged as an extremist, according to two police officials, speaking on condition of anonymity because they weren't authorized to publicly discuss the investigation.
Brandet said officers were "deliberately" targeted, as has happened repeatedly to French security forces in recent years, including in the run-up to the 2012 election.
Police and soldiers sealed off the area, ordering tourists back into hotels and blocking people from approaching the scene.
Emergency vehicles blocked the wide Champs-Elysees, an avenue lined with boutiques and normally packed with cars and tourists that cuts across central Paris between the Arc de Triomphe and the Tuileries Gardens. Subway stations were closed off.
The gunfire sent scores of tourists fleeing into side streets.
"They were running, running," said 55-year-old Badi Ftaïti, who lives in the area. "Some were crying. There were tens, maybe even hundreds of them."
French President Francois Hollande said he was convinced the circumstances of the attack in a country pointed to a terrorist act. Hollande held an emergency meeting with the prime minister Thursday night and planned to convene the defense council Friday morning.
The incident recalled two recent attacks on soldiers providing security at prominent locations around Paris: one at the Louvre museum in February and one at Orly airport last month.
Speaking in Washington during a news conference with Italian Prime Minister Paolo Gentiloni, U.S. President Donald Trump said the shooting "looks like another terrorist attack" and sent condolences to France.
A French television station hosting an event with the 11 candidates running for president briefly interrupted its broadcast to report the shootings.
Fillon, who has campaigned against "Islamic totalitarianism," said on France 2 television that he was canceling his planned campaign stops Friday.
Far-right candidate Marine Le Pen, who campaigns against immigration and Islamic fundamentalism, took to Twitter to offer her sympathy for law enforcement officers "once again targeted." She canceled a minor campaign stop, but scheduled another.
She also called on the government to restore France's borders immediately, saying that France should exit the European passport-free Schengen area.
In a statement from her campaign headquarter in Paris, she said she wants foreigners signaled as Islamic radicals to be expelled from the country and French nationals identified for the same reason to face trial.
Centrist candidate Emmanuel Macron offered his thoughts to the family of the dead officer.
Socialist Benoit Hamon tweeted his "full support" to police against terrorism.
The two top finishers in Sunday's election will advance to a runoff on May 7.