A conventional doorway, of the kind capable of opening in one direction only, is adapted to resist forceful entry by a caller, even after initial opening of the door by an occupant, due to the presence of a generally rectangular and at least partially translucent closure member which is secured to either the door or the door frame, is movable towards and away from an operative position in which it engages respectively either the door frame or the door, and includes means allowing it to be releasably secured in said operative position to prevent opening of the door through more than a predetermined angle, the closure member then bridging the gap which would otherwise have appeared between the door and the door frame so that entry through the doorway by the caller is denied until said means securing the closure member has been released by the occupant.
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