A heart-shaped formation made of balloons is seen during a commemorative ceremony in Nice,France, on July 14, 2017. Various activities were held on Friday in Nice to commemorate the terror attack on July 14, 2016 when a man drove a truck into a crowd in Nice and killed 86 people. (Xinhua/Vincent Nogier)

PARIS, Sept. 8 (Xinhua) -- France's anti-terrorism units have foiled 11 terrorist assaults for the January-September period, said Interior Minister Gerard Collomb, warning that eventual attacks could break the calm at home.

"Eleven attacks have been thwarted since the beginning of the year and obviously, it could happen tomorrow in France what was happened in Barcelona," Collomb said, referring to the van assault that left 16 victims last month in Spain.

During the previous two days, French police detained three men after they found equipment and material suspected to be used for making explosives in an apartment and in a box in the southern suburbs of Paris.

France remains top target of terrorist cells due to its military intervention in Iraq, Syria and the Sahel region.

It had imposed emergency security rules in the wake of Paris attack on Nov. 13, 2015. Since, then a wave of attacks struck the country with the bloodiest being at Rivera city of Nice where a man drove his truck into a crowd, killing 86 people on Bastille Day last year.