French hooded police officers cordon off the area after a knife attack Thursday, Aug. 23, 2018 in Trappes, west of Paris. A man flagged by French authorities as a suspected radical killed his mother and sister and seriously injured another woman in a knife attack Thursday that was quickly claimed by the Islamic State group. (AP Photo/Michel Euler)
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French hooded police officers cordon off the area after a knife attack Thursday, Aug. 23, 2018 in Trappes, west of Paris. A man flagged by French authorities as a suspected radical killed his mother and sister and seriously injured another woman in a knife attack Thursday that was quickly claimed by the Islamic State group. (AP Photo/Michel Euler)
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Police officers take position outside the Louvre museum in Paris,Friday, Feb. 3, 2017. Paris police say a soldier has opened fire outside the Louvre Museum after he was attacked by someone, and the area is being evacuated. (AP Photo/Thibault Camus)
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A picture shows the debris of an explosion after French anti-terrorist police (RAID) raided an apartment, where suspects believed to be involved in plotting an attack were arrested, in an apartment building in Clapiers, near Montpellier, southern France, on February 10, 2017. Four people including a 16-year-old girl were arrested on February 10 by anti-terrorist police in Montpellier on suspicion of preparing an attack, a police source said. The other suspects were aged 20, 26 and 33, according to the source. The four were arrested after buying acetone, a highly flammable liquid that can be used to make bombs. France remains on high alert after a wave of attacks which began two years ago that has claimed more than 200 lives. / AFP / SYLVAIN THOMAS (Photo credit should read SYLVAIN THOMAS/AFP/Getty Images)
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Police officers stand on guard behind the church of Saint-Etienne-du-Rouvray on July 26, 2016, following an attack by two knife-wielding men. The Islamic State group said on July 26 that the two assailants who stormed a church in France and killed an elderly priest were its "soldiers,". They stormed the church during morning mass, taking the five people inside hostage and slitting the throat of its priest Jacques Hemel, who was in his eighties. The attackers were killed by police after they emerged from the church when it was surrounded by France's anti-gang brigade, the BRI, which specialises in kidnappings. / AFP PHOTO / CHARLY TRIBALLEAUCHARLY TRIBALLEAU/AFP/Getty Images
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A woman mourns in front of the house of Father Jacques Hamel on July 27, 2016 in Saint-Etienne-du-Rouvray, where the priest was killed the day before in the latest of a string of attacks against Western targets claimed by or blamed on the Islamic State jihadist group.
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Story highlights

Ten suspects arrested in connection to alleged weapon sales used in January 2015 attacks

Amedy Coulibaly killed four at kosher supermarket in Paris before police shot him dead

CNN  — 

French police are questioning 10 people they believe could have supplied weapons to Amedy Coulibaly, the terrorist who killed four people at a kosher supermarket in Paris in January 2015.

A spokeswoman for the Paris prosecutor told CNN that ten people from northern France and Belgium had been taken into custody since Monday, including several arrests on Wednesday morning.

Coulibaly’s deadly siege at the Jewish grocery store in an eastern suburb of Paris occurred just two days after brothers Said and Cherif Kouachi stormed the offices of the French satirical magazine Charlie Hebdo, killing 12 and injuring 11.

Armed soldiers patrol a school in the Jewish quarter of Paris following the kosher market attack in January 2015.
Armed soldiers patrol a school in the Jewish quarter of Paris following the kosher market attack in January 2015.
Jeff J Mitchell/Getty Images Europe/Getty Images

The three assailants were killed by police in separate standoffs.

The police will be investigating possible links between the detained and their alleged connections to selling weapons used for the January 2015 attacks, the spokeswoman said.

France has been plagued by a series of terror attacks in recent years. It declared a state of emergency after coordinated attacks in Paris killed 130 people in November 2015. Subsequent incidents, including last week’s deadly attack on a police bus in the heart of Paris, has kept the country in a heightened state of alert.

CNN’s Margaux Deygas contributed to this report.