At least four police officers have been killed in a knife attack inside the police headquarters in the heart of the French capital, Paris, according to media reports.
The attacker was shot dead by the police.
Paris Mayor Anne Hidalgo confirmed that “several people” were fatally wounded, but she did not confirm the exact number of fatalities.
Thursday’s attack occured in police headquarters on the central Ile de Cite, across the street from Notre Dame Cathedral in the French capital around 1pm local time (12GMT), according to the official.
The motive of the attack was not immediately known.
France’s interior minister and the Paris prosecutor were on their way to the scene.
The popular tourist area was cordoned off in the wake of the attack and the local metro station shut down.
The attack came a day after thousands of officers marched in Paris to protest low wages, long hours and increasing suicides in their ranks.
Police officers have also been targeted in recent years.
In 2017, a gunman opened fire on the Champs-Elysees boulevard, killing one officer before he was shot to death.
A year earlier, an attack inspired by the Islamic State of Iraq and the Levant group killed a police officer and his companion, an administrator, at their home in front of their child.