A man stabbed and killed four officers at the police headquarters in central Paris on Thursday, before being shot dead.
The premises was kept out of zone after the attack in the historic centre of Paris, usually thronged with tourists, and a dozens of police and emergency vehicles had converged at the scene, AFP journalists reported.
At least one metro station in the vicinity of the building, which is close to Notre-Dame cathedral and other major tourist attractions was closed.
Sources told AFP the attacker was shot dead by police in the courtyard of the building, where he was employed.
The man worked in an administrative capacity but it was not immediately clear what his precise work role was.
An emergency message was broadcast over loudspeakers at the courthouse next door, announcing “an attack” at the police headquarters and stating the area was “under surveillance”.