Four police officers have been killed in a knife attack at the police headquarters in Paris, says a union official.
The attacker, who worked in the building, was shot dead at the scene.
It happened at about 1pm local time at the large police building, located just across from Notre Dame Cathedral.
The motive for the attack is unclear.
Police union official Loic Travers said the attack appeared to have started in an office and continued elsewhere in the large compound.
They are seeking a second person with connections to the attack.