Abstract: A security door, adapted to close off a secure area, is supported in hinges which allow the door either to open inwards to, or outwards from, that area. Normally the door is arranged for inward opening, and closes against a strike assembly including a stop member and a bar, both screwed to the door frame. If the normal inward opening path of the door should become blocked, access can still be gained to the secure area from the outside by releasing the components of the strike assembly from the frame and then opening the door outwards. However, even with the strike parts removed the lock bolt still engages in an aperture in the door frame so access can be gained to the area in this way only by key-holders or equivalent authorized personnel.