/particle not working correctly

Neither : /particle cloud ~ ~ ~ 2 1 2 0.001 20 @e[type=Creeper]
nor : /particle cloud ~ ~ ~ 2 1 2 0.001 20 force @e[type=Creeper]
nor : /particle cloud ~ ~ ~ 2 1 2 0.001 20 normal @e[type=Creeper]
actually show the particles around the targeted entity but around the command block/player who triggered it.