Diversionary device

A diversionary device has a housing containing a pyrotechnic cartridge with an ignitable fuse. A firing arrangement includes an ignition cap containing a primer charge. Passageways in the housing and ignition cap define a first flow path from the primer charge to a region of the housing in which the fuse is located through which flash from the primer charge can flow to ignite the fuse. A further flow path connects said region of the housing with the exterior of the housing to supply the fuse with oxygen for reliable burning. The device may be a multi-burst device containing a plurality of cartridges and the first flow path may include a flash divider for directing a proportion of the flash from a primer charge on to the fuse of each cartridge. The housing may be separable to allow replacement of the cartridges.