Two persons have been killed and one seriously wounded in a knife attack in the Paris suburb of Trappes.

ISIS has claimed responsibility for the attack, according to Reuters.

It was later revealed, however, that the two persons murdered are the attacker's mother and sister. Now police are checking the possibility that the incident is criminal in nature.

Police told Le Parisien that the attacker was in a pavilion shouting, "Allahu Akbar," and threatened that "If you enter I smoke you all."

He was shot by police after coming out of the pavilion and threatening officers, according to Le Parisien. Reuters reported that the attacker has died.

Le Parisien also said that the attacker has been known to police since 2016 as someone who has incited to terror.

Trappes, home to a large Muslim population, has in the past had about 50 locals who went to fight for ISIS in Syria and Iraq, French security sources have told AFP.