The official killed Friday was a 49-year-old administrative employee who worked in the station for the national police service, a spokesperson told The Associated Press.
Police shot and killed the attacker at the scene, authorities said.
Francois Bersani, the Secretary of SGP Police Force, said, "With the first elements we have, it's becoming clear it's a terrorist act targeting a police officer."
Bersani said the style of the attack is a "well-known signature" of previous terror acts.
French media reports identified the suspect as a 37-year-old French resident with no criminal record or record of radicalization.
A French judicial official said the suspect was born in Tunisia and that witnesses heard him say “Allahu akbar," Arabic for "God is great,” during the attack.
The judicial official was not authorized to be publicly named speaking about an ongoing investigation.
Anti-terrorism prosecutor Jean-Francois Ricard told reporters that his office took over the probe because the attacker had staked out the station ahead of time, because of statements he made during the attack, and because he targeted a police official.
Ricard did not provide details on the attacker's identity or motive
