The woman, who has not been named, was attacked at lunchtime on Tuesday in the Rempart Saint-Etienne area.
A man, reported to be of Algerian origin, tried to grab the officer’s gun and it is understood that when he failed, he pulled out a knife, repeatedly stabbing her in the throat.The woman is in a serious condition and the area around the polcie station is in lockdown.
French media are reporting a 31-year-old man has been arrested.It is claimed the man entered the station under the pretence of making a complaint.The motive behind the attack is unclear.
France has been on high alert after Islamic State terror attacks since January 2015.
In November 2015, 130 people were killed in Paris when multiple bombers attacked restaurants and the Bataclan theatre, as well as a football stadium.Following that attack, France introduced a state of emergency.
It was due to end after three months but tragedy struck in Nice when a jihadi killed at least 84 people when he ploughed a truck along a packed sea-front, while firing at the crowd.
In July, Father Jacques Hamel in Saint-Etienne-du-Rouvray, was murdered by IS militants.
The 85-year-old was killed when his throat was slit during a hostage situation at the local church. French police killed the IS-inspired attackers, Adel Kermiche and Abdel Malik Petitjean, both 19, as they tried to flee the church.