Russia’s FSB security service said Thursday it had killed Islamic State militants who were planning a “terrorist attack” on a Moscow synagogue, Russian state news agencies reported. The FSB said an IS cell based in Kaluga, southwest of Moscow, had been planning to shoot Jewish worshippers at a synagogue in the capital. “While being arrested, the terrorists put up armed resistance to the Russian FSB officers, and as a result were neutralised by return fire,” the TASS news agency quoted the security service as saying in a statement. “Firearms, ammunition, as well as components for the manufactur…