A man stabbed and badly wounded a policewoman in the town of La Chapelle-sur-Erdre in western France on Friday before he was arrested in a shoot-out.
The assailant had been caught after a manhunt that involved two police helicopters and more than 200 officers.
There was a shoot-out during the arrest and two officers were shot and wounded.
The stabbed policewoman was in a critical state, BFM TV reported.
"The police have neutralised the suspect behind the knife attack against a municipal policewoman in Chapelle-sur-Erdre. Thank you and my thoughts for those officers wounded making the arrest," Interior Minister Gerald Darmanin tweeted.
Darmanin said he would be travelling to the scene of the attack.
The assailant's motive was not immediately clear.
The office of France's anti-terrorism prosecutor said it was monitoring the situation but was for now not leading the investigation.
The incident comes a month after a female police administrative worker was knifed to death near Paris by a Tunisian national.
US President Donald Trump and the leaders of Greenland and Denmark signed an agreement on Tuesday that permits a larger US military presence on Greenland and may resolve a standoff over the strategically located and mineral-rich island.
An F-16 fighter jet assigned to the US air base Spangdahlem in western Germany crashed on Tuesday, the US military said, adding that one pilot had ejected safely and was receiving medical treatment.
US President Donald Trump on Tuesday called for complete economic isolation of Iran, showing no intention to resume talks at the UN General Assembly but saying he believed a deal would be done after the US midterm elections in November.
Donald Trump is set for a whirlwind schedule of meetings with leaders from four continents at the UN General Assembly on Tuesday, against the backdrop of the wars in Ukraine and Iran that show no signs of abating.
A student opened fire in front of their high school in Turkey's western province of Manisa early on Tuesday, wounding at least 11 other pupils, Justice Minister Akin Gurlek said.
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