PARIS, France — French anti-terrorist prosecutors on Sunday opened an investigation after weapons were found in a car parked in a Paris suburb that is home to a large Jewish population.

Three hundred people were evacuated on Saturday evening from a neighborhood in Sarcelles, north of Paris, following reports of a suspicious vehicle, which was found to contain “a military-grade weapon,” according to France’s interior minister.

An investigation has been launched “on charges of forming a terrorist criminal organization with a view to preparing crimes involving attacks on persons and the transport, possession and acquisition of weapons in connection with a terrorist enterprise,” the prosecutors said.

France’s Interior Minister Laurent Nunez said on BFMTV that the vehicle was found near one of the town’s several synagogues.

“We do not yet know the motives,” Nunez said, adding that “the individuals have not yet been identified.”

A security cordon had been set up on Saturday evening around the car, which was parked........

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