Trappes (CNN) Two people were killed and one "badly injured" in a knife attack Thursday morning in Trappes, a suburb west of Paris, according to France's National Police.

The attacker was killed, police said.

"After the attack, he ran into a house to hide. He left shortly afterward and threatened police before being neutralized," police said.

Authorities have not yet given an indication of a motive for the attack. The matter may have been a family dispute, CNN French affiliate BFM-TV reported.

The two people who were killed were the attacker's mother and sister, a spokesman for the Interior Ministry told CNN.

Read More