The powers granted to the representative of the State in the département by article L. 3131-8 may be exercised, under the same conditions, by the prefects of the defence zone and by the Prime Minister if this is justified by the nature of the health situation or the scale of the influx of patients or victims. The requisitions provided for in article L. 3131-8 are then issued by order of the defence zone prefect or by decree of the Prime Minister.