The source notes that a gunman opened fire on police at Paris' iconic Champs-Elysees boulevard late on Thursday, killing one officer and injuring at least two others.
The Belgian federal prosecutor's office denied any link between Belgium and the attack on Thursday night on the Champs-Elysees in Paris, media reported on Friday.
The man suspected of carrying out the Champs-Elysees attack was detained and freed in February for threatening to kill police.
Police swept through the family home in Chelles in eastern Paris looking for evidence of links with Daesh "ISIL", who claimed he was acting on their behalf.
One police officer was killed and two more were injured in a shooting in Paris on Thursday, multiple news outlets are reporting.
"A little after 9 PM a vehicle stopped alongside a police auto which was parked".
49ers, Bears "most antsy" to trade down in first round
The same may be true in 2017, as there is no clear top quarterback in the class, at least not according to the popular analysis. How many trades did the Bears make during last year's draft? Whether it's one of the teams that's he has visited or another.
Paris: The man who shot dead a French policeman in an Islamist militant attack had served time for armed assaults on law enforcement officers, police sources said on Friday, as authorities sought a second suspect flagged by Belgian security services.
The Islamic State identified the attacker as Abu Yusuf al-Beljiki through its Amaq news agency, according to SITE Intel Group, a USA -based organization that monitors terrorists' activity online.
So close to the presidential election, "the country's on edge", Eleanor says, adding that thousands of police officers are on the streets.
The attack came just three days before the first round of voting in France's upcoming presidential election, derailing campaigns in a tense four-way contest.
He had also wounded two police officers. The statement said the attacker is a Belgian national. What can you say?
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. "We have to be strong and we have to be vigilant, and I have been saying it for a long time".
Ms Le Pen, Mr Fillon and Mr Macron have announced they are cancelling campaign events scheduled for Friday, the last day of canvassing for votes. "This kind of terrorism is an attack on the entire civilized world, and we resolutely condemn it", Abe said in the message, released by the Foreign Ministry. "I am ready", said independent candidate Emmanuel Macron, while radical left Jean-Luc Melenchon promised that "criminals will never remain unpunished and their accomplices will never be forgotten".