Story highlights Plot centered on the national commando training center, Paris prosecutor's office says

Four suspects, ages 16 to 23, were detained this week, interior minister says

The "main instigator" of the alleged plot has ties to jihadists currently in prison, he says

(CNN) Four terror suspects detained by French intelligence agents were plotting to behead a senior military staffer at a military site in southern France, a spokeswoman for the Paris prosecutor's office said Thursday.

The alleged plot centered on the national commando training center in Port-Vendres, near Perpignan, said Agnes Thibault-Lecuivre, and was due to be carried out in late 2015 or early 2016.

The suspects planned to film the scene with a GoPro camera, she said.

Interior Minister Bernard Cazeneuve said Wednesday that the suspects, ages 16 to 23, were arrested in four parts of France at dawn Monday on suspicion of planning a terrorist attack against "military installations."

One of them is a former sailor in the French navy, he said in a statement.

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