At least 6 people were injured in an attack at Paris’ Gare Du Nord train station, restricting access to one of the French capital’s major rail hubs, writes CNN.

An individual began attacking people at 6:42 a.m. local time and was neutralized a minute later, according to French Interior Minister Gerald Darmanin. The individual was disarmed by off-duty police officers who were going home and by border police, Darmanin said.

The attacker made the weapon himself, Darmanin added. Paris police had earlier said the individual started attacking people with a knife at 6:45 a.m. local time.

Several police officers opened fire, including a security agent working for rail operator SNCF, police said. Multiple shots were fired and the alleged attacker was injured.

A spokesman for the Paris Prosecutor’s Office said six people were injured, including a member of the French border police. One of the injured is in critical condition. The suspect is also in a critical condition, the spokesman said. The motive for the knife attack is unknown, according to the Paris Prosecutor’s Office.