Shortly before the incident, the man had stabbed at least four people in a room at a hotel, with one victim in critical condition, according to French media.
One person was killed while two French police officers were seriously injured in eastern France last February during a demonstration in support of Congo.
Heitz added that one of the seriously injured police officers was wounded in the carotid artery, while the other sustained a chest injury.
French Interior Minister Bruno Retailleau is expected to visit the site of the attack later today, Saturday.
According to union sources, the suspect in the incident, who was born in , was under judicial surveillance and house arrest and was under an expulsion order from France, according to Agence France-Presse.
