Vaguely reminiscent of the old anti-terror posters we had over here for 30 odd years.
Government security poster from the 70's.
Another Government security poster from the late 70/80's.
Anti-terrorist poster marking Bloody Friday. Google that shit for more info as I would only start off on one.
One from the bad boys, basically keep your mouth shut or your dead. And they often carried out that threat.
Police force poster memorial for those murdered by the bad boys above..............just before they disbanded the police because the bad boys demanded it.
There are tonnes more, unfortunately I couldn't find any of the specific ones I remember from my military days.