Abstract: A fire warning device includes detachably connectable shell parts (1,2) which when brought together are mutually united to form a shell or casing (3) which houses a fire sensor (20), alarm emitter (21) and a power source (22). The shell (3) being provided with fire warning device suspension means (8, 9; 16, 17). The suspension means (8, 9; 16, 17) is comprised of a friction anchoring device disposed in the region of the border surface or interface (6) between the two shell parts (1,2) when the shell is closed. The friction anchoring device is disposed in a passageway that extends between two mutually opposite ends (4,5) of the closed shell and enables the shell to be closed around a rod, cable or chain that carries a light fitting, while connecting the cable, rod or chain to the friction anchoring device for suspending the fire warning device.