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(CNN) - A man armed with a knife attacked officers inside the police headquarters in Paris, a police source told CNN.
Two police officers were seriously injured during the attack, the source said, and one of them died. According to a police source, it is believed that the "number will increase."
The attacker was an administrative officer employed by the police, according to the same source. The motive of the assailant is not yet known.
France's interior minister, Christophe Castaner, is heading to the scene.
Nearby roads were blocked when emergency officials responded to the police headquarters in Paris, where an individual launched a knife attack on agents on Thursday.
Île de la Cité, an island in the Seine in the center of Paris, is enclosed after the attack.
All roads to Île de la Cité have been cordoned off by the police. Firefighters and ambulances are on the scene.
