French authorities have branded the killing of a police officer and his partner a "terror attack," after a French police chief was stabbed to death in front of his home late on Monday and his partner's body was found inside, Reuters report.
The attacker repeatedly knifed the 42-year-old commander in the stomach before barricading himself inside the house in a Paris suburb, an Interior Ministry spokesman said.
He was shot dead by members of an elite police unit after negotiations failed.
Police and judicial sources said that the attacker was a 25-year-old man who had been monitored by security and anti-terrorist services after he received a three-year prison sentence in 2013 for helping Islamist militants go to Pakistan.
Meanwhile, the Islamic State group's Amaq news agency said the attack was carried out by a member of the group, although the claims have not been verified.
A judicial source said the anti-terrorism unit of the prosecutor's office had been given responsibility for the investigation because of comments made during lengthy exchanges between the assailant and negotiators. The source gave no further details.
"Source to Amaq agency: Islamic State fighter kills deputy chief of the police station in the city of Les Mureaux and his wife," Amaq said on its news website.
President Francois Hollande held an early morning emergency meeting over the killings, his office said before Amaq posted its statement, underscoring the seriousness with which the Elysee presidential palace is treating the incident.
If it is confirmed Islamic State was behind the murders, it would be the first militant strike on French soil since the government imposed a state of emergency after multiple attacks on Paris in November that killed 130 people.
Monday's killings took place as France, a founder member of the U.S.-led coalition waging air strikes against Islamic State, was already on high alert for terrorist attacks during the Euro 2016 soccer tournament which began on Friday.